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Question by Kathleen: My ’94 Subaru Loyale has been idling rough and now stalls when ever I come to a stop. Why?
My ’94 Subaru Loyale has been idling rough and now stalls when ever I come to a stop. I have to keep one foot on the brake and the other on the gas in order to keep it running. What is going on? Please help!

Best answer:

Answer by Rebel
If the car runs fine while driving and cuts off ONLY when you are idling (foot completely off the gas pedal and RPM’s at idle speed) then your idle air control valve my need adjusting or need to be replaced, or idle air passage make have been blocked off by excessive carbon build-up. If build-up is the problem, a good removal and cleaning will do the trick or an off the shelf spray cleaner may get the job done as well.

Could also be clogged fuel injection system. Try a fuel treatment with a full tank of gas.if a older model GM front wheel drive it could be the lock-up solenoid on the transmission. or it could be a stopped up catalytic converter on about any make and model.
First thing id do is check and change the fuel filter, its usually checked by blowing air through it (in the arrow direction) if no air flows through or it blows through slowly then its more than likely plugged change it and go from there. sometimes after all avenues have been followed and the problem still exists i have seen the sock on the fuel pump be plugged and do the same. it will run great while accelerating but stall at idle due to not enough fuel pressure.

Please chect the EGR valve to see if it is stuck open with a chunk of carbon. This will cause an internal vacumn leak and the car will not idle. To test the EGR valve (Exhaust Gas recirculation) pull it off and try to blow thru it. Also look to see if the EGR pintle is seated. If the car you are having the problem with is a Chrysler then the plate that seals the EGR will likely be completely missing. The fuel filter will not cause this problem as the fuel demand at idle is very low. A clogged Catalytic Converter will also not cause this problem.

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