I would start by cleaning the throttle body and the idle air control valve. Here's a DIY on the later 5SFE engine. Your 3SFE engine should be almost identical:
http://www.toyotanation.com/forum/showthread.php?t=158097
If that doesn't help, I would then start checking/replacing the ignition system components. Plugs, plug wires, distributor cap and rotor. If that doesn't help, I would then check the coil inside the distributor. To do that you will need a digital volt/ohmeter and the spces from any manual. If you don't have a manual you can download one for free at the top of the Camry forum over at AutomotiveForums.com. Here's the link to those manuals:
http://www.automotiveforums.com/vbulletin/showthread.php?t=497839
I would also remove the coil and inspect it carefully for cracks. That's a known trouble area on these cars as they rack up lot's of miles.
Mike
http://www.toyotanation.com/forum/showthread.php?t=158097
If that doesn't help, I would then start checking/replacing the ignition system components. Plugs, plug wires, distributor cap and rotor. If that doesn't help, I would then check the coil inside the distributor. To do that you will need a digital volt/ohmeter and the spces from any manual. If you don't have a manual you can download one for free at the top of the Camry forum over at AutomotiveForums.com. Here's the link to those manuals:
http://www.automotiveforums.com/vbulletin/showthread.php?t=497839
I would also remove the coil and inspect it carefully for cracks. That's a known trouble area on these cars as they rack up lot's of miles.
Mike