2010 stumbles (and sometimes stalls) when cold

well, as the title suggests, Scoot Scoot is exhibiting a stumbling issue about two minutes after a cold start. if im parked, the engine will attempt to stall (and if it does, the Computer Controlled Cranking System no longer works, and I have to hold the key as if I were starting our Suzuki SX4) and if I am moving, like if I just pulled out of my driveway; the RPMs will drop down to idle even though my foot has not moved, stay at idle for a second, then jump back up to where it was before it dropped; and it will do this two or three times, then act normal; or if I bury the throttle while it is dropping to idle, it will jump back to the previous RPM and then start climbing to appease the sudden demand for throttle. the throttle body was cleaned when my converters were replaced, and the Intake hose was replaced just before the converters were replaced. there are no DTCs to report, or else I would have mentioned them. any help or advice (and please be civil about it) is welcomed.

Does it continue as the engine is warmed up? Sounds like your throttle body may be going bad.

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Originally Posted by Daox

Does it continue as the engine is warmed up? Sounds like your throttle body may be going bad.

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No, once the engine is warmed up, it no longer does it; it only does it if it is the first start of the day, or if the engine has been sitting for enough time to where the temperature gauge is sitting on the cold mark.


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I would check the Idle control valve that is part of the throttle body. Ohm out the feed back loop. Sorry I don't have a manual to go over the numbers.

My 2005 misfires on cold starts; usually a lot worse when the weather is colder. I can barley get into first gear without it stalling. But If I wait a few minutes for the engine to warm up, all is fine like nothing happened. Being that this is just a beater car used to go back and forth to work, it doesnt bother me, but I would still like to fix the problem if I knew what it was.