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5th gen engine problems

1051 Views 4 Replies 4 Participants Last post by  lloydjv
yea i have a 91 st with auto (4a fe piece wanting to convert to 3s gte, lol) and for sum reason when i barely tap on the throttle the rpms will fluctuate and occasionally stall, i replaced the pcv valve and that stopped it. For a week, and now its back. Anyone no how to fix this? thanx
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A dirty IAC can cause all kinds of problems with idle. I have seen a thread somewhere regarding the cleaning of the IAC, but I can't remember where.
I am not sure about the 4afe, but the 5sfe has coolant lines running to it, so if you remove it for cleaning, perhaps drain the coolant a little, and plug those hoses until you are done.
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