RE: stals in gear
There are a couple of possibilites. One is that the idle air motor is not bumping up the engine speed--that may be due to it not working or carbon build up blocking the port on the intake plenum. The other possibility is a locked up torque convertor clutch which is a much nastier issue. If you are in neutral and turn on the A/C system, does the idle speed go down, up, or stay about where it was? That may give an indication if the idle air system is working.
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