Stumbling

HAPPYDAD

MEMBER
1998 TOYOTA TACOMA
4 CYL
2WD
MANUAL
450 MILES

Thinking it was bad gas, I put a tank of high test in, the second tank I put Stp octane booster. If I don't rev up the engine before changing gears, and do it fairly slowly, it stumbles. At 55 miles an hour, if I mash the pedal, it tries to stall. The chassis has 449,000miles theingine was changed at 429,000 miles. When I enter the number on the screen, it won't recognize it.

Monday, November 15th, 2010 AT 11:10 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Lack of acceleration, chugging, hesitating, jerking, 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

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Tuesday, November 16th, 2010 AT 4:09 AM