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Would be a lot easier with some scan tool data. Even with no codes, could be an in range failure of a sensor. For a wild guess, I say coolant temp sensor not reading proper temperature at all times due to faulty sensor or wiring, and providing cold start enrichment to a warmed up engine.
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Artie
73 Camaro 25.3 build TT LS in progress
67 Camaro
99 T/A
Other crap not worth mentioning
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