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stock pulley

  1. Problems & Troubleshooting
    I have a 2004 Redline. I bought it and then realized it had an aftermarket pulley. Measured it and it seems to be 3.1". I think it's gm performance. But my car just threw a code for a miss in cylinder 2 so I want to take it back to stock. Idk what is causing the miss. Im hoping just a spark...