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Discussion Starter · #1 ·
I just put a down pipe on my 2016 vt and now it’s throwing p0300 p0301 and p0302. And when it does that my car starts to run like shit. But all I have to do is shut it off turn it back on and it’s fine again. I also have a ram cold air and bov. I changed the plugs and valve cover gasket bc when I pulled the first plug there was oil on the threads. It’s still doing the misfire thing. It never did this before the down pipe. Is this because I need a tune or something else?
 

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2014 Veloster Turbo Manual
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4,221 Posts
what plugs did you put in and what gap?
 

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2015 auto VT, 2013 manual VT × 2
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6,486 Posts
Can be many causes. Chances are high you do not have proper plugs, gaps, coils, fuel, or old components. Also chance something else on the car is not working with the mods.
 
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