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Start by replacing the FUEL PRESSURE REGULATOR, located on the fuel rail atop the engine (fairly simple and inexpensive procedure). If the problem persists, use a fuel pressure gauge to verify that your fuel pump is producing enough pressure and, if not, replace the fuel pump AND the fuel pick-up screen in the gas tank.
If you have a hih miles truck,it is very possoble you have aclogged cat.Have a muffler shop test pressure in front and behind by drilling small holes,checkin w/gauge,then welding back.This should be free if you replace the cat.
sounds like you might have a clogged exhaust, this can happen if catalytic converter is coming apart, the pieces will lodge themselves in the muffler or downpipes and restrict exhaust, causing it to back up into engine and cause vehicle to bogg down. To test, disconnect exhaust between manifold and catalytic, it will be loud, but you can test if engine revs better, if so replace cat and check rest of exhaust for debris and empty out.
Inadequate fuel pressure, change the fuel filter first, make sure the car sits for at least two hours before replacing the fuel filter because these fuel lines are under high pressure during the time of operation. The pressure usually decreases over time in the lines but wear safety glasses just the same, I would recomend depressurizing the fuel system first, buy a Haynes repair manual for detailed procedure to be safe. If problem persists go to Auto Zone and ask them to check for trouble codes these codes if present may instuct you in detail to replace the MAF sensor or give you a code that must be looked up to find the problem.