1994 Toyota Corolla ENGINE RUN ROUGH ESPECIALLY ON HILLS OR

1994 TOYOTA COROLLA
20,200 MILES • 4 CYL • 2WD • AUTOMATIC
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LARRYFOY
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  • 1 POST
WELL THE ENGINE STARTED RUNNUNG ROUGH AROUND 200,000 SO I ASSUMED IT WAS TIME FOR A TUNE-UP. AFTER THE TUNE-UP NOT A THING CHANGED. IT SEEMS GOING UP HILLS WHERE EXCELLERATION IS NECESSARY THE ENGINE RUNS ROUGH (LIKE BAD WIRES OR PLUGS) AND VIBRATES
UNDER 40 IT IS BARELY NOTICEABLE UNLESS THE MOTOR IS STRAINING. I HAVE BEEN SEARCHING SITES AND FOUND SOMEONE WITH A SIMILAR PROBLEM HE WAS TOLD TO TURN A SLOTTED SCREW ON THE FRONT OF THE INTAKE MANIFOLD, A COMPLETE ROTATION COUNTERCLOCKWISE AND HE CLAIMS IT SOLVED THE PROBLEM. BEFORE I START MESSING WITH MIXTURE SCREWS I WANT TO SEE IF YOU CONCUR.
THANKS
LARRY
Feb 20, 2010 at 6:37 PM
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MMPRINCE4000
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Idle air screw is LAST option.

Remove and clean the throttle body and IAC.

Adjusting that screw is like putting a band aid on a deep cut.
Feb 21, 2010 at 7:14 AM