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could be a boggle of things but lets start with basics first the gas tank debries in tank and filter clogged which when it cuts out the suction is lost and debries fall back to bottom of tank again dirty fuel sifon out and filter check for debries bad thermo sensor it can cut off if stuck in position loose wire from change in your plugs rotor cap might have hit a wire by accident air filter clogged
generator failing throttle body needs cleaning
now the more rough end the crank or cam sensors speed sensor bad ground now the 1991's were known for a burn out ground melting of the shielding around ground wires next to exhaust and hot areas of car this had been remedied by simple longer wire replacement and or new shielding added to wire
1) High idle switch is on..*(vehicle thinks AC is running but it isn't.
You can try turning on the AC and see if the engine slows down to confirm this one.
2) Sticking or worn out Idle Air Control or IAC, You might get a check engine light with this one.....you might not if it's a mechanical failure.
3) Simplest of all. A vacuum leak. You can get the engine vacuum read while running if you go to a mechanic with a vacuum guage or an OBD 2 ecu code reader. There should be specs on what vacuum levels are normal for you car at idle.
You have to check ur idle speed controller, that is located at the back of battery protected by a plstic shield, remove the shield and remove a small controller located next to the computer compartment and check the fuse, the problem wd b solved by replacing the fuse otherwise u will have to replace the idle speed controller, if this will not fix the problem, ur computer has to be reset by company, hope this will fix the problem
stick the key in the drivers door and turn it to the left and right in different patterns until it turns off. it works every time with me but i cant find the exact pattern
Typical idle for this motor is right around the amount you have described. Check to see if any check engine lights are on, or if the ABS light is on. A typical issue with this motor is the OVP relay that when not operating properly causes the engine to rev much too high (~1500-2000). Also do your revs drop significantly when you put the car into gear? If not then there really isnt an issue. When the motor is idling too high and you stick it into gear the car will typically lurch really hard.
i would start with checking the spark plug cables in some cases if there is a bad wire it can cause a irratic or high idle being a 96 it is probably fuel injected so i would check the throttle cable and throttle body it may need some cleaning or a sensor may be off such as the idle control valve.
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