Hey guys,

Just wondering if i can get some help/opinions on what could be the cause of my issue.

Its a Jdm K20a with a Rotrex C38-61 SC on it. Its recently been tuned and was running great for about a week.

Now its developed a bad misfire under WOT.

The Car drives good cruising around at low rpm with under 5% throttle, but as soon as i step on it.. The RPM climbs to about 3k and then starts misfiring/hesitating/sputtering. It is as if boost is just blowing the spark completely out.

So far i have tried:

- New TPS Sensor
- Different coilpacks
- Iridium Spark plugs heat range 7-9s with gapping from 0.032" to 0.020"
- Checked fuel pressure (datalogs show that it isnt leaning out or anything and AFRs stay fine)
- New MAP Sensor
- Air intake not clogged etc (Boost is being registered in datalogs, so there is no leaks)
- No leaks on my IM
- Quick visual check over most my sensor plugs that the pins were all still intact.

I think thats about it..

It started after i took the car for a 1hr drive; so heat may have been a factor. I also filled up my car with fuel. Could possibly be a bad batch? even though it drives fine on minimal throttle and cruising?

If you have an idea's id love to hear them!

Any help will be appreciated


Thanks

Ash.