Mechanics

RUNNING ROUGH

1991 Nissan 240SX

Engine Performance problem
1991 Nissan 240SX 4 cyl Two Wheel Drive Automatic 140000 miles

Car starts ok, but when driving it run ok for awhile then gets rough. Other then plugs and wires or bad gas, what should I check?

Also, when driving down the road, sometimes the RPM's go up with out touching the gas pedal.
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Uconn7kmw
February 18, 2009.



Inspect/clean/test the IACV-AAC valve and the throttle position sensor

Rasmataz
Feb 18, 2009.