My car has been idling very strangely for the last little while and I've been so busy fixing over stuff on it that I haven't had time to examine this idling issue.
It started acting up after I used some intake cleaner back in September.
1992 GXE with A/T
Here's what it does:
None of these symptoms are temperature related either.
When I start the car it'll idle around 1600rpms. When I'm stopped at a light with the car in gear it idles normally at 700rpms. If I put the car into park or neutral the rpms bounce around in between 1300-2000rpms. Another issue is when I'm driving over 80km/h and take my foot off the gas the rpms will bounce up and
down. This is weird and I'll fix it when I figure out what the hell is going on.
I'm going to replace the IACV, MAF & TPS this weekend hopefully it'll be one of those. Luckily everything will be cheap because I'll get the parts from a wrecking yard.
Anybody got an other ideas as to what might be malfunctioning.

 

You might want to pick up a FSM or a Chilton's and run through the diagnostics and troubleshooting procedures. It could save you some money instead of using the "replace and pray" method. Good luck.

 

i got a haynes. it's not very useful.
do many dealerships still carry the fsm for our generation?
i've asked a couple and they say that the fsm isn't being sold anymore.

 

check ebay...but dont bid on the one i have a bid on!

 

I just bought a 92 max and it does the EXACT same thing you described.

Did you happen to solve the problem?

Let me know
Mark