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I'm having a problem with my automatic 2009 Cobalt LT. It usually starts out with the tac going up and down very fast and the engine feels like it is bucking. Sometimes this will develop into a further problem where the RPMs slowly go to zero and I get absolutely no response from the throttle. Other times after the tac goes crazy it will just go to zero the car will run fine it just shifts harder than normal. I have take it to two different shops where they both told me they didn't have good enough equipment to work on it. Both shops said there were codes but no lights ever came on. Here are the codes I got from one of the shops.
P0010 Intake cam shaft position activator solenoid control circuit
P0335 Crankshaft position sensor circuit
P0336 Crankshaft position sensor performance
P0506 Idle speed low
P0711 Trans. temp sensor circuit out of range over
P0712 Trans. temp sensor circuit signal low
 
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