I think the new gasket on the intake is leaking. Sprayed some PB blaster on the seam where it meets the head and the RPMs went up. Will that cause the backfires and hesitation? I hate changing that gasket again. Is there an easy way to do it? Do you tighten the 3 bolts that hold the intake and exhaust together last? There must be a trick to getting them on right and tight? Frustrated