Hello all, so as the title says i have been chasing this issue at idle / cold start for about a month or so now. Issue started up out of no were with no hardware changes. Randomly got a CEL one day and checked it random multiple cylinder misfire all 4 cylinders 1100rpm time stamp shows cold start. Ok Carbon build up? did a walnut blast the carbon was pretty bad at 55k miles so i thought this would fix the issues, but it did not. The car is stage 2 IE full bolt on minus intercooler piping. Rs7 plugs, oem coil packs. Only thing i can think of is the injectors going out or massive carbon built up on the tips, when i did the walnut blast i did not take the injectors out to look at them.. Wich i am kinda of regreting now.. Any help much appreciated.