I just put a new carb on my car and I have been trying to dial it in. I just can't seem to find the right adjustment. It runs great when it is cold... but as it warms up, it starts to backfire in the exhaust. I have tried making it richer and leaner, but both directions seem to make it worse. Also, when you rev it up, after you let off of the gas it backfires a little then too... but as it is revving up, it sounds really strong. Any help would be greatly appreciated... I suck at tuning carbs!