1999 Ford Ranger Losing power on freeway random

1999 FORD RANGER

13,300 MILES • 6 CYL • 4WD • AUTOMATIC

DSGNGIRL

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The truck runs very good overall, but this last year I've been feeling this stutter or sluggish, almost like a pull in the engine and it's not consistant, some weeks it runs great then the next it might happen 2 times during the week and I've to turn around and go home thinking it was going to break down. I had the fuel pump replaced 8 months ago. I had the transmission serviced, new battery, tires and reg. oil changes and reg services. Alot of times its first thing in morning, so cold and going up hill. We cant figure it out. I brought it to machanic and he couldn't find anything wrong, he couldn't fix it because it ran great for him. thanks

Mar 8, 2010 at 2:57 PM

RASMATAZ

CAR REPAIR CONTRIBUTOR
75,992 POSTS

Lack of acceleration,chugging,hesitating,bogging etc. could be caused by one of the following below.

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.

Mar 8, 2010 at 6:40 PM

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