I have a 95 extended cab with the 4.3 vortec..It runs great (203,000) and drives great,it just doesn't have any power! I've done intake gaskets,tps,iac,egr,,,and new plugs..Cap,rotor and wires are still there the way I bought it,I don't know if they've ever been done.Cap and rotor look good..Oh,and I also gutted the cat and it still has no power..And I also installed a new fuel pump and filter..Any suggestions?I know it's gonna be under powered for a full size truck but I've had one before that pulled WAY better..Any advice??