I'd swap the TPS first then think of the ICM. AFAIK, the ICM isn't known to go bad on the Ecotec as how the coil packs on the 60 Degree V6 do.
I'd clean the IAC too. TPS shouldn't hold you back more than $20 at the parts store.
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2̶0̶0̶3̶ ̶P̶o̶n̶t̶i̶a̶c̶ ̶G̶r̶a̶n̶d̶ ̶A̶m̶
1994 Olds Cutlass Supreme
2̶0̶0̶2̶ ̶C̶h̶e̶v̶r̶o̶l̶e̶t̶ ̶C̶a̶m̶a̶r̶o̶
1996 Infiniti G20
1993 Chevrolet Lumina Z34
1989 Buick Regal Limited
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