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When I start the truck, it will idle at about 3000 rpm and stay there, will idle down occasionally, but only to about 2000 rpm after it warms up, also there is always pressure in the cooling system, if it sets for a week there is still pressure under the radiator cap.
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your throttle body sensor may be bad. first get a can of spray carb or fuel injection cleaner and spray it in the opening for the intake for the throttle body. this will clear out the carbon build-up. when you crank it it will run shaky but shoiuld clear up within a minute
Maybe a short to the TPS or something shorting it out. There's also the IAC that really controls the idle but usually it will cause the RPM's to go up and down a little erratic if bad. The MAF sensor can cause major problems as well but since you already swapped the TPS and it helped and then stopped I would focus on that sensor and especially it's wiring to and from the ECM. Be careful with the sensor signal wire to the ECM can blow it if more than 5v passes or spikes.
this is normal, if the idle wasn't high (about 2,500 RPM) the engine wopuld stall out until it warms up to normal temperature. If it is above 3000 RPM for more than a few seconds you have a problem.
Your problem seems to be the "Idle control unit" It controls the idle control valve. The box is sometimes green or black and is located in the glove box ceiling next to the ECU. It's approx 4" x 6"in size.
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