1997 Cadillac Deville

Engine Performance problem
1997 Cadillac Deville V8 Front Wheel Drive Automatic 189000 miles

I just got this 97 cadillac deville and it doesnt pick up the speed I need to get on the highway. I looked at the fuses and some one took a wire and ran it from the fuel pump fuse to the ecs fuse. The guy I got it from says it had stop getting gas but it wasnt the fuel pump thats out. Help me please.
June 7, 2010.

Inspect and test all the following listed below: 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.

Jun 7, 2010.