1997 Chevy Truck 97 C1500 bogging BAD....

So, a few months back I did a major tune up on my truck....97 C1500 with the 5.7 Vor....had her purring like a kitten....well, just the other day I was headed to the store when it suddenly back fired a few times as it died in the road. Got it pushed back to the house and started tinkering looking for obvious signs....when that didnt turn up anything I went straight to fire. Pulled the cap and lo and behold the rotor had flew off. Evidently in my haste to get the truck back together during the overhaul I didnt tighten the screws well enough. So, Since to rotor was damaged I bought and installed a new one. The truck fired right up and idles great. She'll even have a little pep to her when I first take off....but thats where it stops. Any attempt to accel is met with some horrible bogging....accompanied with a back fire every now and again.

I have....

checked the cap
checked the distributor
checked the ignition coil
checked the timing chain
checked the spark plugs and wires



Its driving me crazy!!!! Did a search of the forums and nothing....any ideas? Any help would be greatly appretiated....Hawg