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Originally Posted by William Lee
I also have this problem, intermittent stalling and cutting out, hard starting at times. Mostly when engine is hot. Feels almost like vapor lock. Starts fine if I spray the air intake with starter fluid. My mechanic couldn't find any problem. Took it to Kia dealer. Couldn't find problem. Tried to sell me a $1400 engine overhaul and tune up. I did the tuneup myself before taking it in.
Only thing Kia mentioned that the engine grounds needed to be redone. I cleaned the grounds. Still have the problem. For now I keep a couple of cans of starting fluid handy. Another thing to do while at idle or stop sign is to keep left foot on brake, right foot on gas to keep engine idling just a hair above idle to keep from stalling out. It's a quick solution for now. If I find the problem I'll keep you posted.
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Your problem with idle is likely caused by a sticky Idle Speed Control (ISC) valve - I have had some success taking the ISC off and cleaning it with carb cleaner.