I recently put a turbo xs dp and tp on my ms3. Plus I upgraded my spark plugs to ngk one step colder over stock. Well, I gapped the plugs to .028 b/c with the cobb accessport, it said that was recommended. Also, I'm running the cobb stage 2 with cobb sr and turbo back exhaust. the V103 map. Well, I had a miss fire today and I was hearing a knocking noise under the hood so I checked it out and my number 4 cylinder spark plug, the electrode was gone! So I put the stock plugs back in and my car is still miss firing and I now have a vacuum leak, lol!!! Well, thats what my codes are reading so. I'm kind of in a bind here. What should I do, since my warranty is now voided, lol. I'm basically lost, also the knocking noise only happens at boost, around lie 4-5k rpms and at idle it feels like it wants to cut off, almost. So Any advice would be greatly appreciated at this time, thanks.