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Your throttle valve and idle speed control valve are sludged up. here is what you need to do to correct this, buy a can of CRC brand throttle valve cleaner, spray it into the running engine while holding the throttle up so it will not stall, use up about half the can, then spray and stall the engine out, let it stand for a few hours or overnight, that will let the cleaner soak the sludge and it will free up the system to properly control idle speed.
Probably a problem with the electronic throttle control , causing the PCM - engine computer to put the vehicle into a reduced power mode . Having it hooked up to a diagnostic scan tool to check for DTC'S - diagnostic trouble code an view sensor input data to the PCM should be the first step in the diagnostic procedure .
Does it run smoothly? If so you probably have a dirty throttle plate and IAC motor. Give me more details about what half way means, RPMs, and how well the vehicle runs otherwise.
it could be due to a malfuntioning tps sensor or a stuck throttle linkage. the tps is located on your throttle body and has a 2 or 4 wire plug the throttle linkage is located in the same are have this looked at... please rate this
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