1999 Mercury Sable

Engine Performance problem
1999 Mercury Sable 6 cyl Front Wheel Drive Automatic 103000 miles

When accelerating modestly, the engine often seems to falter momentarily, and then surges for a second, and then settles back to normal acceleration.

Did the 100k tune up at 98,000k and this problem is unchanged.

Is this the computer?
September 2, 2010.

Hi nyandjim, Welcome to 2carpros and TY for the donation

Lack of acceleration, chugging, hesitating, bogging, misfiring etc. Could be caused by one of the following below: Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock 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 it.

Sep 2, 2010.