What causes this difference? Sometimes when i start my car in the morning - 86 xt coupe MPFI - it will either do one of two things.. sometimes it will start and rev aroun 900, and overall seem to preform sub-par. other times, it will start and rev at 2 or
2.2k and run better.. sometimes ill start it, it revs normal (2-2.2k), park at the store, and when i come out and start it it revs low(900 or less)... what causes this and how do i fix it??
JB