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Start by cleaning out the throttle body and the idle air control valve. It may be as simple as that. Do a search here for "throttle body cleaning". There are some good posts on the subject including one with some good pictures. If that doesn't cure the problem I would next check the engine coolant temperature sensor (Toyota calls it an ECT sensor). You will need the specs from any manual and a digital volt ohmeter to do this. There is a generation 3 Toyota factory service manual stickied at the top of the General Camry Forum, that is available for free downloading. If the coolant temp sensor checks out OK, I would then check the coil inside the distributor. Again you will need the DVM and the specs form the manual to do this.
Mike
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