GM-GMC: 1997 Chevy P.U, acceleration, fuel pressure regulator, fuel system components

Question
my '97 2 wd, v-6 has lost most of its ability to accelerate over the past few months...If I try to quickly accelerate it bogs down and even backfires sometimes now...It runs smoothly around town so long as I don't try to speed up quickly...on the highway I have to nurse it along from 25-40 for awhile til I find a downgrade and then I can slowly get it to speed up to 60+
the air filter is clean...I had the engine replaced last year but perhaps not all the fuel system components, egr etc...its getting so I spend $500 every time I bring it to the garage and things are tight, so I'm wondering if you can steer me towards possible problem components...thanks  

Answer
1. Weak fuel pump pressure and or low fuel volume.

2. faulty fuel pressure regulator.

3. Restricted fuel injectors.

4. improper EGR control.

5. faulty ignition timing advance.

6. Weak ignition coil(s).

7. Fuel contamination.

8. restricted exhaust. (partially plugged catalytic coverter(s).



tom