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Grinding noise under hood in park.

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I replaced my ECM and FCM plugs with pigtailed aftermarket plugs.  When I started the truck it idled normally but when i pressed the accelerator there was a loud grinding noise under the hood.  What could I have done to cause this?


It sat for over a month before I made the repair.

Disconnected batteries first.

Spliced wires one at a time.

Reset throttle sensor before starting.

No codes.


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