1990 Mitsubishi Montero idle control

1990 MITSUBISHI MONTERO
250,000 MILES • 6 CYL • 4WD • AUTOMATIC
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COOLMASTER
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ok my montero has a problem with rpm, when i start the motor the choke run good the problem is when the choke turn off the rpm go up 1500 rpm for 2 seconds and then go to 900 always in parking or neutral , when i put on D on the transmition the rpm are in 1000 and runs good ,i did the timing with the computer jumper in ground
Mar 30, 2008 at 1:34 PM
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RASMATAZ
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Is it a Carb or an EFI fuel system?

You probably have a sticking throttle plate/kinked acc. cable or a problem with idle air control valve/motor and the throttle position sensor-
Mar 31, 2008 at 6:33 AM