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This might be normal behavior. From the book Auto Fundamentals, pg. 146-147 in the section "Cold Start Aids": During cold startup on some systems, an auxiliary air regulator admits additional air into the intake manifold to increase the idle speed. The auxiliary air regulator is controlled by a thermostatic switch located in the engine water jacket. ...


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This sounds like a problem with the Idle Air Control (IAC) valve, or something in that general vicinity. You should try to clean it and the upper intake tract.


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Strangely, after about 1500 miles the problem went away. I'm not sure why this is, though I was told by the individual that helped me with the replacement that new pumps sometimes require a "break in" period. I haven't heard that opinion echoed anywhere else, however it seems to have been the case for me... If it changes I will update! Thanks again for ...



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