[mrclean]

I have a 92 Sho. Sometimes when I stop at a light or something, the rpms will dip to 600, then to 400, then stall, but then I can start it right back up again and it idles fine. If it starts to dip, and i rev the engine, it stops stumbling. This makes me confident its not the Cam or Crankshaft sensor because it kicks right over again with no problem. So is there anything that would cause this intermittent stumble/sometimes stalling problem. And by the way, the A/C is not on when this happens, partially because when I turn it on I hear slippage, and if i turn it off the slippage stops. So, sorry for the long post, but any ideas?

 

[mrclean]

Could it be the fuel filter or bad spark plugs?

 

[Bob Gervais]

Could be a lot of things. Vacuum leak, dirty IAC motor, MAF or TB all come to mind. Any codes?

 

[jedhead]

The first thing to do is to pull codes. The procedure is posted here:

http://www.shotimes.com/php-bin/modules.ph...&thold=0&sid=83

On common cause of your symtoms is the IAB (Idle Air Bypass) valve is clogged. This valve allows enough air to keep the engine running when the throttle is closed (idling). Cleaning procedures are here:

http://www.shotimes.com/php-bin/modules.ph...&thold=0&sid=82

Common causes for stalling are here:

http://www.shotimes.com/php-bin/modules.ph...&thold=0&sid=76

bob

 

[mrclean]

I do get a code intermittantly, but it doesn't come on immediately when I start it, I have to drive it for a few mins, then it will eventually throw a code...so hopefully the car will store it in the memory.

 

[pimpin90GL]

mine kept stalling on me whenever i would come to a stop, i fixed it by resetting the idle.
to do this first unplug the battery, then turn the highbeams on to drain all the electrical systems. keep the lights on and battery unplugged for at least 15 minutes. then plug the battery back in, and start the car. don't touch anything for 30 seconds so the idle will stabilize. ater that, put the car under full accessory load, MAX A/C, high beams, fog lights, press the brake, turn the wheel, etc... keep that up for about 5 minutes, and then go take it for a quick ride. after that your idle should be fine and you shouldn't stall out when you come to a stop.

 

[mrclean]

Well..I might be able to do some of what you're saying, but I can't turn on my AC on max because when I turn on my A/C on my belt starts slipping on me...so....I might not be able to do that....

 

[Bob Gervais]

There should be codes stored. Get them read, and post them. We can help from there. :thumb: