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Mschlichtman

Rough idle then stalls

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I recently acquired my 1988 GL wagon about a month ago. Everything is sound for the most part and I enjoy the hell out of it. This past week I made a trip out to Tennessee and everything ran fine. On my way back through St Louis I ran into heavy stop and go traffic. When I shifted into first at a stand still noticed that the rpm became sporadic jumping from 1.5 to 2.5 and eventually stalling a couple of times. It never happened if when I tried to replicate it in second or third. I'm going back out that way in about a month and would love to figure this out. Any help would be appreciated.

 

It is an ea82 spfi if that helps.

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Could be the trottle potion sensor.. I have noticed I can make mine do the same thing if I don't wait for total warm up... but in your situation is quite different... it could be somthing thing to do with the choke which I am pretty sure has something to do with water temp but I have also read throttle position sensors with have the same Rev up and down symptoms and there is a hose that connects to it and the other into the front of port.. could be cracked ...not unusual that vacuum lines present problems

Edited by Len Dawg

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88 should be spfi, no choke. Unless there is a variation I don't know about...

 

The coolant temp sensor can cause weird random idle variations intermittently. Without causing the ECU to show a code.

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I have had occasions where morning starts rough idled and stalled. I cleaned the IAC by removing the hose and a cap full of Berryman's. Haven't had the issue since. 

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