Sup my fellow mazdaspeed peoples.

So first thing is I absolutely love my ms3 in just 4 weeks of owning it.on about my 3rd week of driving it developed a cel with a hell of a misfire.my question is,is it common for injector wiring to go bad?

 

Whalecum to mso! Seems like you either have poor connection to that primary o2 sensor or it's done, injector harness is usually pretty rugged. Did you do any work or the previous owner that you know of? I'd be popping off that intake manifold and re seating all your injector connections ensure they're clean and no bent pins.
Also check your grounds, particularly the one on near your hpfp (actually start there before pulling the intake manifold) it's a small black wire if it has poor connection it will cause multiple issues

 

Oops,yes it has front mount intercooler,cork sport ram intake,Cobb air intake tube,as far as tune I don’t know and hpfp but with the mods and seeing what the boost gauge went 17(max) has to be tuned …I’m assuming stock turbo as last year it was rebuilt

 

Check the injector harness for bent pins and loose connections

 

Seems I’ve fixed the issue.I unplugged the pcm and plugged it back in and pressed most connecters that I could reach tightly together now it runs like a champ again.