Check the idle Air Control Valve...located near the throttle body, air intake plenum...remove the solenoid, spray out the housing with injector cleaner...wipe out after...should turn your rag black with carbon...pray the solenoid too and wipe clean...you can replace this solenoid for about $35. set itself when you drive over 35 mph...also check air filter...needs replaced every 12,000 miles...also add gas tank additive injector cleaner...STP super concentrated works great for me...Hope these inexpensive fixes work for your GP...
SOURCE: Pontiac Grand Prix 98
When the window is not used often or gets a little older the motor can "Hang Up" You might try having someone hold the down switch on the drivers door while you slam the door. This will sometimes jar the motor enough to make the brushes contact and start working.
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