backfiring ar wot mpi apex

[kinger]

Yes stay with stock plugs, one guy ran with the normally upgraded CR10EK and said they were worse, stock heat range seems to be the best.

 

[rxwhopper]

thanks for the info kinger

 

[machz69]

I had the same thing when it was real cold out?.. It was back firing under wot. I started to think it was the fuel?.. not enough with supreem. Mine was also bouncing off the rev ltr big time off the line. so it might have been un burnt fuel... not sure?