Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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when you done the engine swap,did you use the throttle body fuel injetion?
the transmission,does it just not shift,or does it shift like into neutral?
ok,,for the engine,,remove and clean the egr valve,,it may be dirty and sticking open causing a vacuum leak from the exhaust,,also,remove and clean the iac-idle air control valve.
the 4.3 computer will work with the 5.7
as for the transmission,,you have a bigger problem,,sense it shifts like it gos into neutral when its time to shift to 3rd..
i would think the 3-4 clutch frictions are burnt out,,the transmission will need to be rebuilt or replaced to fix this problem,,sorry
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