my car has the same POP (backfire) and my MPG is terrible too.. I was thinking O2's or something too the check engine light comes on after a lil bit of driving but then if i cut the car off and restart the light goes off.. also I have a slight bucking at low speeds with part throttle That might be my CAMSHAFT though. I too have longtubes and a NEW MOTOR i checked CTS ACTS, EGR you name it i am stumped too thanx
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SOLD THE 87GT, .. GT40, 70mmTB, 75mmBullet, 24lbinjectors, cold air induction, Edelbrok 6025 Rpm's, Inch phonolic spacer, tall FMSvalve covers, an SFI balancer, Canton 7quart, the shortblock... Lunati 51025 (224/232 .535/. 544 @112 deg) Ross lightweight pistons (10:1) Eagle H-Beams, Total Seal plasma Moly Rings, Clevite bearings, ARP throughout, FMS main Girdle&Studs, Forged Crank, of course HV-OilPump and hardened FMS shaft, Dual Friction centerforce, T5, and 4.10's Longtubes and 2.25 tail pi
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