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Threw code P0301. Cylinder 1 misfire. It happened just after i installed my JBA LT's. What could possibly make this happen? I havent installed the new tune yet either.
 

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LT's can cause the engine to not run correctly with out a proper tune. load up the correct tune with the Lt's tuned up and i would think it should be fine. im sure someone here may know a bit more.
 

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Shouldn't cause a misfire though. Agree you should try the new tune and then see what happens.
 

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When you make changes that require a tune, You need to install it before you start the car. Try installing the tune and see what happens.
 

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The only reason you would get a code is because the O2 sensors are located further from the engine and are taking longer to heat up.
 
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