Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 97 GMC C1500 Misfire › Reply To: 97 GMC C1500 Misfire March 30, 2020 at 2:50 am #953814 Richard KirshyParticipant You state vacuum om the low side of good and fuel trims all over the place. Might suggest smoking the engine and look for any vacuum leak(s)