I have a 2010 535i I just replaced my coils and plugs and they went away. I bought one step colder plugs and gapped to .022 and I now get a misfire when I floor it. It happened in cylinder 3 at first and then I cleared the code and cylinder one popped up next.

 

Have you tried stock plugs? They should be pre-gapped.

 

no I bought one step colder because my stock ones went bad after 5k miles and I’m on mhd stage 1+ and I have a cp, and an exhaust. Also I’m new to this and I’m learning so bear with me.

 

What stock plugs went out in 5k. What was the part number? I personally would stay with the stock gap. Did you have misfire issues when they were in

 

Why do you think that colder plugs will solve your "stock ones going bad after 5K miles"? 5K miles after installing mhd 1+ etc.? Or after installing new plugs? Stock plugs should work fine with 1+ etc.. What do you men by "bad". Burned, corroded? Perhaps your tuning (+1 etc.) is to blame and colder plugs aren't going to solve that problem, but might be causing your "new" misfiring problem.. Re-install stock plugs and go from there.