Have a 96 camry 4 cyl auto. After highway driving, the idle becomes rough and wants to stall. The problem eventually goes away after driving a city speeds. Around town, it runs all day just fine. Help ,...
Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Problem turned out to be timing casing gasket had fallen apart due to age. A piece got into belt track and it wore and broke. Belt had been replaced at 40,000 so at least wasn't brand new. Dealer putting on new belt foer 199.00. Shooting for 250,000 miles on this car. THANKS for input
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