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427 issue

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Granite 427 issue

Having an issue with my 427 after dealer installed new exhaust studs. The first time they started it, it blew an injector. They rebuilt injector but it only lasted 3 hours. Replaced injector, no power and engine sputtering.replaced all 6 injectors, no difference. Then dealer decided computer has gotten antifreeze in it from coolant sensor so they replaced harness and ecu. No difference. Got a super hot program from mack which actually helped a little, but still no power and low rpms (1200 to 160
Mland917

Mland917

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