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Posted on Jan 02, 2017
You likely have broken pieces of catalyst in the exhaust getting wedged in the exhaust pipe just before the main catalytic converter. This will cause intermittent stalls when the vehicle is warm and sometimes will take 20 minutes to cool down before starting and driving properly a short distance. On my Santa Fe I cut the pipe near the catalytic converter, removed the broken catalyst, then had to replace the "front" catalytic converter.
Posted on Sep 30, 2012
Mine does the same thing when the oxygen senor goes out... About every 70k miles. doesn't always turn on check engine light
Posted on Feb 16, 2009
I had a 1987 Century and when mine started acting like that I took it to a garage and they hooked it up to a computer tester for free. Is she getting the check engine light coming on? They found that mine was running (lean) which ended up being my fuel pump. Which is in the gas tank and can be pricey to get done, between $250-$350 and of course the filter would get done at the same time and that is only$20
Posted on Jun 26, 2009
Tips for a great answer:
Jan 02, 2016 | 1999 Honda Accord
Dec 29, 2014 | 1987 Mazda 323 4-Door
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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