I have to feather the throttle when stopped in traffic, it will stall if I don't. Also I have to open the throttle to start it, and it also feels like a very breif stumble on the highway as I ease off the throttle. No codes are stored, the CEL is not on. I replaced the IAC simply because I wound up with a new one on the shelf, it made no difference. Also I swore I could hear a vacuum leak at the intake, sprayed with throttle body cleaner and got a better idle at one port, so I changed both the upper and lower gaskets, no difference
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And the motor only does this when fully warmed up to operating temp, when it's cold and as it warms up it seems normal.
What do you guys think I should check or test? Is there anything else you need to know? TIA.
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