Bill I need some help with my vspec. The engine ran fine for the first half gallon after break in averaging normal temps. Very shortly after break in I noticed the engine was starting to hesitate and bog slightly about mid to upper rpm but would clear itself out once in the higher rpm range still in the 200- 250 degree mark. However the engine will now hesitate, sputter and stall out as i throttle upto midrange. On the starter box i get full the full range of throttle authority but on the track when the engine is under any load the engine will only rev up to just under mid range stall out. I have tried everything i can think of. Re tune, change plugs ( p3 hot ) check for leaks, change fuel filter and all to no joy. Now i should mention that when i do put a new plug in the engine runs normal for about 3 laps ( 2-3 minutes )then the whole issue starts over again.

fuel is 20% with 14 % oil
os p3 hot plug
stock engine with no change
ofna jp 4 pipe

Thank you,

Shawn