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did you scan for fault codes and what are your fault codes ?
crank case sensor would not do it and you would have check engine light on
THAT CODE WILL BE WRONG TIMING ADJUSTMENT OR WORN CAM SHAFT HUB AND SOLLENOID TO REMOVE CAMSHAFT HUBS IS VERY BIG JOB AND REQUIRES SPECIAL TIMING TOOLS SO IF YOU HAVE THAT CODE I WOULD START THERE ALSO PLEASE RATE POSITIVE WE WILL STAY LOCKED AND YOU CAN TALK TO ME