How can i stop it backfiring? i installed an intake manifold, and it idles good, but i cant give it any gas. I installed a crosswind manifold. Its a 350 with a really small carb for the motor which is getting changed sometime soon, other than a K&N and a flowmaster exhaust its stock. Its a 76 if that give any one else any ideas. Orginally it was backfiring through the carb but adjusted the distributor a little and it now idles good, the problem occurs when i give it some gas, even in low rpm's. Also for some reason i can give it gas when in park and it wont backfire as much but when i try and test it out in drive it will do it a lot more.