Dude, this would be kinda an obvious one but check for exhaust leaks. My car ran like complete @ss when I was leaking through the crossover tube. I had backfires and hesitation and very poor cold operation. When I got my new american thunder and stock 4 cat, she will actually idle and run cold.
__________________
91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
|