Join Date: Feb 2019
92BlueLightning is offline
HELP!!!! 2.8L TBI rough idle and other issues
Hey guys I need some help figuring this out. I have a 1992 GMC Sonoma with the 2.8L V6 with the throttle body and manual transmission. So I have have replaced the plugs (I also just check the plugs again a couple days ago to see it there is any damage to them and found oil on cylinders 1/2/5/6), wires, distributor cap/rotor, TPS, and IAC thinking it will stop the rough idle and the weak takeoff. When I start it up it idles as if there is a misfire and when it warms up it has a huge amount of power loss. Also when I take it up to interstate speeds (anything greater then 60) and shift into 5th gear it immediately starts to lose power and speed. The truck has 261k on it and still fires up with very little issue. Sometimes when I start it, it just keeps turning over until I put the accelerator to the floor, then it will start. I have done everything I can think of to fix the issue and have had no luck with it and am wondering if it's the electrical or something else. If anyone has a clue to what it is, I would greatly appreciate the help.