1991 Chevy Suburban no power

1991 CHEVROLET SUBURBAN
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MTS-N-MT
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Engine Performance problem
1991 Chevy Suburban V8 Automatic 170000 miles

i've changed cap,rotor,plugs,fuel filter and still have no power and runs sluggish. Is it possible that I have a vacum leak through the base gasket for the throttle body?
May 20, 2010 at 3:41 PM
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RASMATAZ
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Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard
May 20, 2010 at 4:14 PM