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First and foremost, find out if the ECM is putting out any diagnostic codes(error codes). You can do this with software like BlastZ or ConZult, or by setting the ECM to Diagnostic Test Mode. There are many write-ups and posts with the steps to do this at this website, just search the forums. It could be many things, from the Power Transistor Unit, wiring/ECM harness to the ECM itself. Good luck!
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