Jacobchevys
Newbie
98 K1500. Stock original motor. Have had truck for 15 years. Had this problem for a couple years now but just recently started digging into this to fix it.
So here we go- Truck runs smooth everywhere EXCEPT going up hill(cresting a hill), going to pass on the freeway, merging, anything above 55mph that has any load on the engine. I have to be really ginger and watch how long I hold the gas pedal so it doesn’t misfire. Misfire is strong engine will shake and won’t stop until I let off. I have to wait about 5 seconds otherwise if I get back on the gas it will start shaking again. WOT is ok from O to 45mph. Any longer misfire will occur. Can’t really go 25% Throttle for more than 5 seconds. Cruising at 70mph is great. If I push it to 75-80mph misfire will occur.
Any ideas or anyone had similar problem. I’ve done very thorough research and there seems to be a bunch of “fixes” from the TSB recall, to sensors, to MFI upgrade, to CMP Ret ETC.
A little busy right now so I will post the things I’ve done to fix here shortly.
Until then any input or recommendations?
So here we go- Truck runs smooth everywhere EXCEPT going up hill(cresting a hill), going to pass on the freeway, merging, anything above 55mph that has any load on the engine. I have to be really ginger and watch how long I hold the gas pedal so it doesn’t misfire. Misfire is strong engine will shake and won’t stop until I let off. I have to wait about 5 seconds otherwise if I get back on the gas it will start shaking again. WOT is ok from O to 45mph. Any longer misfire will occur. Can’t really go 25% Throttle for more than 5 seconds. Cruising at 70mph is great. If I push it to 75-80mph misfire will occur.
Any ideas or anyone had similar problem. I’ve done very thorough research and there seems to be a bunch of “fixes” from the TSB recall, to sensors, to MFI upgrade, to CMP Ret ETC.
A little busy right now so I will post the things I’ve done to fix here shortly.
Until then any input or recommendations?