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After swapping the plugs yesterday, seems like most of the symptoms have gone away and there there is not much left to look at. Will try swapping the newer previous coil back in later to see if the misfire problem persists after the plugs were installed, or if the codes just happen to be...

No reason for replacing other than preventative, just maintenance. Yeah Im sure they're legit, had them ordered through my parts counter at my local mazda dealer. Haven't had a chance to test to see if P0303 persists as the car is in pieces right now, haven't had the P0300 since the inital...

Currently under the car now, plugs to go in after. Checking the PCV, all the hoses are still secure, the check valve on the OCC moves freely when shaking. Tested the flow, but I have no baseline as to how much vacuum I should be feeling or hearing in rpms. The vacuum was enough to suck my finger...

Swapped cyl 2 and 3 coils, misfire migrated to 3, so I swapped it with my old coil. Test drove it, throttle feels better, almost back to normal in terms of response, maybe placebo but I don’t think so. Pins in all the coils look straight. Problem does still persist. Gonna clean out the filter...

Didn’t get a chance to do any work tonight. Plugs should hopefully be delivered tomorrow. Will swap the coils then, probably gonna gap the plugs to 0.026. Doesn’t hurt to check the pins either. Yup, agreed, maf sensor cleaning was on that list for tomorrow. The filter could definitely use a...

Ok, sounds good. I’ll swap them tonight and see what happens from there. Honestly never thought that OEM coils from the dealer would die this quick.

Will definitely take a day this weekend to take a look at everything you've mentioned. I am leaning towards something to do with the PCV or the OCC check valve as well now, but checking inside the cylinders won't hurt either. I'll check the flow through the hose that connects to the valve cause...

That’s where i’m stuck right now. Any suggestions as to what to look for when I put my borescope in besides the piston heads? I’m also thinking maybe it’s something to do with the tune? Unfortunate timing cause I wanted to throw on my downpipe sometime soon and get it freektuned but the car is...

The part number is stock heat range, I referenced an old post from Awafrican. I'll swap over the coil to see if it follows.

Eh, relatively cheap to replace so I dont mind. I dont know if it makes a difference but I do alot of short driving trips, an average day is max 20-30 kms a day round trip. I'll take a look at the OCC over the weekend. I logged a bit more data and added Accel Pos. The 3rdaccel file corresponds...

Prior to this issue I changed nothing recently, and recent is within the last 10k kms. This issue is like a random issue that happened overnight I guess. The issue does only occur when in boost, at different psi ranges, but within the 9-16 psi range. Other than that, it cruises in every gear...

SOLVED Year/Make/Model: 2012 Mazdaspeed 3 Mileage: 150,000 kms / 93,000 miles Location: Ontario, Canada Concern: Motor sputtering/misfiring under load near/in peak boost DTC's: P0300 Multiple/Random Misfires Detected, P0302 Cylinder 2 Misfire Detected, P0403 (EGR Delete) Modifications: Cobb AP...