is it possible for belt tensioner being a lil sloppy and cause PO300?

Question

04 isuzu acender replaced spark plugs fuel filter and air filter as well still giving this code PO300  but the engine seems to fluctuate with serpentine belt tensioner.

Answer 1

Yes it is possible that the misfire condition was caused  by the drive belt , but those where vehicles that had the CKP at the front where the harmonic balancer was, these where the GM vehicle,