I have a 85 mustang, I replaced the engine with a used engine. The idle speed goes to 3000 rpms shortly after starting, stays there until the pedal is tapped then falls to 1000 rpm for a few seconds then right back up there. I have replaced the tps, and idle motor assembly, i have tested the computer and there are no on demand or keep alive codes. cant get it to run the koer running test because after 6 cylinder id the engine goes to 3000 rpm. I do not have a break out box. I dont know how the car ran before because it set for 4 years with a bad engine. it does not matter if the egr is un plugged it does the same thing. also Map seems to be functioning. Any suggestions would be helpful.
Read more: idle on my 95 mustang is 3000 rpm no vacume leak... - JustAnswer
Read more: idle on my 95 mustang is 3000 rpm no vacume leak... - JustAnswer