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Generally speaking, the only way for the idle speed to increase is if extra air is getting past the throttle plate. So that could include the throttle plate sticking open, the idle air control valve not closing, or a vac leak somewhere such as a hose or gasket. If you can cover the throttle body with something and the engine still runs at a high speed there is a large vac leak somewhere.
I would try changing the fuel filter first just to rule it out. If that doesn\'t help, I would check the TPS. Throttle positioning sensor. How does it start? Does it idle ok when you start it in the morning? If you live in a cold climate, watch these fueling stationsthat load their gas up with ethanol. It\'s hard for filters and fuel pumps. You can buy a once a month additive however Let me know how you make out
Engine stalls cold or RPM
fluctuates at idle up and down or dies near idle.
is commonly caused by a dirty automatic idle speed control valve and
throttle valve but always run a OBD2 fault code as well as the
cleaning procedure. Buy a can of throttle valve cleaner (do not use
carburetor spray cleaner!) from NAPA or Carquest (made by CRC
chemicals) and spray it into the air intake while the engine is
running, use up about 1/2 the can, engine will try to stall hold the
speed up, shut it down and let it soak for 30 minutes, restart and
blow out the remaining fluid, shut it down and disconnect the
negative battery cable for 5 Min's to reset the base idle control. If
the above cleaning doesn't cure your issues you need to have the
computer controlled automatic idle speed control system diagnosed and
repaired by a dealer or electronic engine control repair shop.
Have you ever cleaned the automatic idle speed control valve and threottle butterfly? It may be your problem. Try the following to clean these parts.
To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.
This idle condition is normal for a cold start, the computer is controlling the idle for proper fuel burn. It is not necessary to wait five minutes for the idle to come down. Allow about one minute before putting into gear and driving.
You've got a leak somewhere in the hose, or you left a connection open. You just need to get into it and find it. Not any good way to describe what to do, but the high idle speed is due to a vacuum leak.