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What Are You're DTCs???
Your mechanic should have scanned your ECM (multiple times) to determine issues related to the crank sensor or other (electrical) issues. Without DTCs, neither you nor anyone on this forum can understand the root cause of your issue. You're operating blind and people on this forum are guessing based on what they read here or somewhere else. If you or your mechanic don't have HP Tuners software then SPEND the $$$ so that u know the root cause of your problem and stop guessing and throwing parts at the problem and not resolving the issue. Present your DTCs (CEL) here so you get some sophisticated answers and not newbies acting like they know. If your mechanic doesn't use HP Tuners or GM scanning software go to someone else or a dealer (I hate to say dealer because they can be ill-equipped as well based on my first-hand knowledge).
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