Not sure if this will help or not. I have the same problem with my 99 camry, when on IDLE, engine is hesitating or it seems that my transmission is engaging and disengaging on and off. But after running above 10 mph, or 1500 RPM. It seems to run fine. It was my spark plug wires. I replaced it with NGK spark plug wires, and that problem disappeared. Other suggestions are: 1. Check if there is any vacuum hoses disconnected. 2. Change your spark plugs. 3. Try to check also your PCV valve. (The L shape plastic above your valve cover with a hose connecting to the intake manifold.). Lastly (for temperature going above normal at idle), I used 10w40 oil now with an addition of 1 quart of Lucas oil stabilizer ( recommended oil is 5W30, but this is only for low mileage engines.)
As I said, this is only from my 99 Camry experience. It may answer your problem or not.
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Sunday, August 31st, 2008 AT 7:20 PM