Jason012
Newbie
OK, so my Sierra has been running horribly now for a while. It was dropping misfire codes, and I replaced the plugs, the throttle position sensor, the fuel filter, not in that order and not in relation to the codes only. I took it to a shop that was able to get it to run better, but what it does is stumble on accel and then when cruising at speed it will “hiccup”, I would call it like a “micro stall”. I’m guessing at this point there may be multiple issues, but that there is a fuel delivery issue. I thought previously however that a fuel pump would either be working or not be working, it would not taper off toward its demise but simply stop working.
Is this not true? Can the fuel pressure be tested without getting at the fuel pump which is above the tank/below the bed?
This is made especially worse right now because my 99 Tahoe is also in the shop because someone tried to steal my wheels, didnt finish the job, and the RR wheel fell off while I was driving. Bad GMT400 week.
Any thoughts? I’m replacing the coil since I may as well and it might improve things, and then why not also the ignition module since I will have the part out. Thing is, I thought this was a fuel delivery problem last year and the shop I took it to was like no, the fuel is fine (they may have pressure tested it then actually, I dont know for sure).
Is this not true? Can the fuel pressure be tested without getting at the fuel pump which is above the tank/below the bed?
This is made especially worse right now because my 99 Tahoe is also in the shop because someone tried to steal my wheels, didnt finish the job, and the RR wheel fell off while I was driving. Bad GMT400 week.
Any thoughts? I’m replacing the coil since I may as well and it might improve things, and then why not also the ignition module since I will have the part out. Thing is, I thought this was a fuel delivery problem last year and the shop I took it to was like no, the fuel is fine (they may have pressure tested it then actually, I dont know for sure).