4.3 Vortec bucks and boggs?
NEW FUEL PUMP, FILTER, O2'S, CRANK, IGNITION TRIGGER, COIL AND MODULE. EASY ACCELL TO ABOUT 1/4 THEN IT BUCKS AND IF YOU FLOOR IT IT STARTS TO BOGG AND DECELL. REMINDS ME OF A CARB RUNNING OUT OF FUEL BUT I HAVE A CONSISTANT FUEL PRESSURE OF 49-53 WHILE DRIVING AND 50-51 AT IDOL. I AM LOST
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Sounds like restricted exhaust...loosen your exhaust pipe to manifold bolts enough to create a huge exhaust leak and see if that doesn't help.
make sure the exhaust is not clogged up. I had a maxima doing the same thing come into the shop last week, a new cat did the trick. Good Luck
how about the the catalytic convertor.they take power away when they are plugged or partially plugged. have you checked the air filter(remamber some vehicles have more than one).also what about the pcv valve.chevy rocks!!