Hi, I need some help trouble shooting a 67 Camaro with a 327 motor I picked up recently. It starts and idles OK but when I put it in drive and steps on the gas, it sputters and back fires. The car does not pick-up and accelerate. Can someone help guide me what to look at to fix this problem. Could this be caused by a bad coil ? I have already bought a can of carb cleaner and and cleaned the carbs. Thanks,