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It is one of the two. First thing is to remove and check the plug for gap and condition. Then reset the code and run the vehicle. If it does it again, you swap the coil pack from Number 4 to Number 1. If the misfire them moves to number 1 you know the coil pack is the issue. Sometimes just moving it will fix the issue as the connections get remade.
There is no TCM in sunfire only truck have a TCM
you might want to say
PCM and engine soon light flashing cause of misfire engine ....retrieve code and you see P0300 or P0301 or P0302 or P0303 or P0304 .the last number is for the cylinder number misfire and the P0300 for multiple misfire
hope it help
the service engine soon light(ses light) only comes on when the computer has detected a fault in the system and sets the light on and a code in the computer.you will have to have the code pulled to find out were to start your diagnosis to repair.
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