All of you are a bunch of clowns and are not necessarily right.
I have this problem, and it is NOT the TPS or the CTS.
I have done many different tests to be able to verify that it is neither.
I think it is something to do with the injectors or IACV needing to physically warm up or heat up and get "unstuck" after not having been driven a while....probably the IACV.
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Daily driven
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