Finally fired up the K5 today and it took a bit to get her started. I have this "popping" sound coming from the engine at idle. It kinda sounds like a backfire sound. To top it all off the exhaust is giving off some white smoke. What could this be??? Its a 350 4 bolt main with a quadrajet carb. Also the truck was barely creeping in forward and reverse as if like the parking brake was on. I really had to mash the throttle petal to get her to move. I'm getting frustrated with her, guys! Can you help me out! Blazin' in TEXAS!