fordbuff8404
Forum Member
i have an 86 2.9 litre ford ranger. damn near all emissions crap was taken off. it has what you would call an "erratic" idle. it surges (revs) on itself and dies down until it eventually stalls. i was told that a 1990 pcm was put in it. i am on that as of tomarrow. but if that doesnt help, what should i look for? i tried the idle air control and that is working fine. o2's seem to be working. operating temp is only around 160. i can not find any other possible cause to this other than the computer issue.i will see how it goes tomarrow, but hopefully you guys can ponder on this for the night. thanks Motown!