Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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It sounds like they may have left a ground loose or off.A loose or broken or disconnected ground wire can cause this fault here.Most likely this was damaged or left disconnected when the engine was installed.I would have them or another repair facility go over all grounds to the engine and body as well as frame to locate one loose,damaged or disconnected.If they offered to buy it then they may know they messed something up and also may not know how to correct it.
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