I thought this might help out others who may run into the same situation. Symptoms: No power Idles fine Won't hardly get above 3000 rpm, even at WOT. Doesn't miss Good vaccuum Good compression Good plugs/wires/cap/rotor Good fuel flow and pressure Timing is correct Carb is clean and working After all the stuff above was straightened out, that left me with a couple of options. Bad cam or plugged Cat. I had previously tested for the Cat using a vacuum gage- THAT DIDN'T WORK in my case, the vaccuum increased at 3000 rpm and was steady. So with my last 2 options being the cam or the cat, I went the easy route first, tested the cat. Here's how I did it. Drilled a hole in the exhaust right before the Cat, and tapped the hole to 1/8 NPT. I figured if the Cat tested good, I could put in a pipe plug and the exhaust would still be intact. Screwed in a 1/8 barb fitting, hooked a hose up and put a 0-15 psi gage on the other end. Started the truck up, at idle had about 1 PSI= good. Rev the engine up to 2000rpm, 10 PSI= BAD. Put her to 3000 and had a whopping 15 PSI= WAY WRONG. I'm suprised the motor ran at all. You should have less than 3-4 PSI at any rpm. Needless to say, the plugged up cat is in the trash. Man I love driving around with open headers /forums/images/graemlins/cool.gif I hope this helps somebody else out.