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Nothing other than basic bolt ons. My idle no longer jumps around at all while in neutral, but my car still has a lot of trouble during a cold start, really sounds like it struggling to stay running. It'll still throw a misfire code during a cold start. Changing the plugs seemed to have worked...

Never really looked tbh. Nothing high tho. It will also do it if I rev the car to like 2700 rpm while sitting in neutral.

When I mean bump, it goes up and down like 3 times then settles. Doesn’t do it every time tho.

wheels are Miro 398’s 18 x 9.5 et35. And I just changed my spark plugs, checked compression at the same time and pretty much 180 across the board! I also cleaned my MAF. Issue seems to be resolved now, idle seems normal, cold start sounds totally normal now. Time will tell, but I also had my...

Yea they were relatively new plugs that were gapped, but I’m gunna pull them and take look anyway.

Hey guys, just got an account here, however I was a member of the mazdaspeedforums for many years. I’m looking for some help on figuring out some possible causes of my problems. a little background, car is a 2012 speed3, basic bolt on. Full turbo back with high flow cat, Sri/tip, intercooler...