I have had up to here, as they say. My car is a 67 chevelle with a 230 inline and a powerglide. It was running like crap for a while, so I had a tune up done. It consisted of plugs, points, wires and a few other things. I was having a problem with throttle response, so I asked my friend's dad about it. He helped me check it out, and apparently my timing was way out of wack, so we fixed it. It ran great last night, probably the best I have ever seen i t run. Now, as I come home from school, it starts acting up. When I hit the gas, it kinda drops the RPM's down to below idle, then it backfires rather loudly, then it kinda picks up speed. The acceleration is absoulutly ridiculously slow, if at all, and it is eating gas like a 454. Please help me before I either blow the car up or something worse.