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You might want to watch your coolant level. Open your radiator, fill it to full, and start the truck. If bubbles form, you might have a broken head gasket. Also, check to see how your water seperator and fuel filter are looking. But it sounds kind of like a head gasket.
You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.
Check your throttle body gasket, if it's leaking unmetered air it will idle high, this coupled with a bad ignition coil, plugs not properly gapped or old/worn as well as old/worn spark plug wires will cause a misfire that may not trip the CEL light. Also check your idle air control valve to ensure it's working and clean on the inside of the throttle body.
The Idle Air Control valve is what monitors your idle air/fuel mixture. It is is not functioning at normal parameters, then the car will not idle properly. It sounds like your supercharger my have a faulty bearing and may need to be repaired. Your idle issues may be linked to the IAC but it could also be your throttle control sensor. Another problem is the throttle plate shaft will wear on the housing and cause a vaccuum leak causing the air/fuel mixture to be lean. Do you have any trouble codes? If so, have these codes read and it will narrow down the problem.
Hope this helps.
ok this sounds easy when you ran the vehicle the computer controled the idiling motor now that you replace the idiling motor the computer hasnt been reset to except the new parameters
once you reset computer this should bring the idle back down to its specified idle
you can also adjust back of gas pedel the idle cable and on the throttle body by the idling screw