95_1500
Newbie
Sorry this will be a long post but I just came across this site and might as well make my first one here worth it..
I have researched high and low on FSC and general searching for a solution and done everything I can think of at least 5 times over.
The service engine light is not on and checking the codes myself by jumping A and B on the OBD showed no stored codes.
Since September my gas mileage had been going downhill rapidly so early January I decided to change my plugs, it had been around a year since I did it last.
The gap on the ones i pulled was about .050 and when I put the new ones in (AC Delco CR43TS) I did the recommended .035. About halfway home (8 miles or so) I was at a light and noticed she was idling funny and dropped 50-100 rpm for a split second. Accelerated from the light and it was missing/hesitating horribly. Sometimes it idled so bad I was worried it would shut off at a light, but to this day it has never actually died on me.
The next day I checked the cap and rotor, they had some corrosion on them so I replaced them (AC Delco) and it seemed to fix it mostly except the occasional RPM drop and shuddering idle was still there.
Later that day I replaced the wires (Autolite, store didnt have AC Delco in stock) with no difference.
Checked all vacuum lines and began to focus partly on emissions.
List of all items and order in which they were replaced replaced and results:
-Map sensor and vacuum line to intake - No difference
-Fuel filter - No difference
-ICM - No difference
-Ignition coil - Ran decently for a while but still wasnt right. Pulled and double checked the plugs again and it went back to the missing/hesitation. Re-tightened plugs and double checked that all wires were seated properly and got it back to the "almost right" running.
-EGR pintle moved freely with vacuum hand pump so I gave it a quick cleaning and replaced the EGR solenoid
So after all of that i'm still here with the shuddering idle, RPM drops and maybe once a day it will hesitate for a split second upon accelerating.
Next on the list are IAC and CTS.
Tomorrow before work I will go over the whole ignition system again since all of this started with the plug change.
I will say that the problem is where most any "normal" person wouldn't notice the engine shuddering during idle or the rpm drop but this has been my baby for the past 6 years since I got her.
Once again sorry for the novel but after 2 months of troubleshooting and wasting money I couldnt hold off posting any longer.. Any and all troubleshooting advice for me to try until I get my tax returns Friday would be GREATLY appreciated.
I have researched high and low on FSC and general searching for a solution and done everything I can think of at least 5 times over.
The service engine light is not on and checking the codes myself by jumping A and B on the OBD showed no stored codes.
Since September my gas mileage had been going downhill rapidly so early January I decided to change my plugs, it had been around a year since I did it last.
The gap on the ones i pulled was about .050 and when I put the new ones in (AC Delco CR43TS) I did the recommended .035. About halfway home (8 miles or so) I was at a light and noticed she was idling funny and dropped 50-100 rpm for a split second. Accelerated from the light and it was missing/hesitating horribly. Sometimes it idled so bad I was worried it would shut off at a light, but to this day it has never actually died on me.
The next day I checked the cap and rotor, they had some corrosion on them so I replaced them (AC Delco) and it seemed to fix it mostly except the occasional RPM drop and shuddering idle was still there.
Later that day I replaced the wires (Autolite, store didnt have AC Delco in stock) with no difference.
Checked all vacuum lines and began to focus partly on emissions.
List of all items and order in which they were replaced replaced and results:
-Map sensor and vacuum line to intake - No difference
-Fuel filter - No difference
-ICM - No difference
-Ignition coil - Ran decently for a while but still wasnt right. Pulled and double checked the plugs again and it went back to the missing/hesitation. Re-tightened plugs and double checked that all wires were seated properly and got it back to the "almost right" running.
-EGR pintle moved freely with vacuum hand pump so I gave it a quick cleaning and replaced the EGR solenoid
So after all of that i'm still here with the shuddering idle, RPM drops and maybe once a day it will hesitate for a split second upon accelerating.
Next on the list are IAC and CTS.
Tomorrow before work I will go over the whole ignition system again since all of this started with the plug change.
I will say that the problem is where most any "normal" person wouldn't notice the engine shuddering during idle or the rpm drop but this has been my baby for the past 6 years since I got her.
Once again sorry for the novel but after 2 months of troubleshooting and wasting money I couldnt hold off posting any longer.. Any and all troubleshooting advice for me to try until I get my tax returns Friday would be GREATLY appreciated.
