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Discussion Starter · #1 ·
Long story short, my 2013 Cruze LT had a coolant leak and it overheated, had to drive it a little bit to get back home. Found the leak which was simply a hose on the top. Replaced that hose and no more coolant leak. Now however the check engine light comes on and off, but only after I drive on the highway for about 5 miles and it warms up. When I first turn it on and drive in town it runs fine, but after driving on the highway it starts to misfire and run rough. The light blinks sometimes and sometimes stays on, also it even turns off and other times comes back on, and the code is P0304 engine 4 misfire. I looked under the long ignition coil plug and did see some oil in two of the spark plug holes.

Was wondering if maybe the overheating just possibly caused the valve gasket to leak or if it could have possibly caused worse problems. It wasn't running rough until after the overheating problem.
 
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