This issue popped up last weekend at summit motorsports park.

When out on track the car would get extreme misfires when at partial throttle (i.e. in the turns), however when going WOT the car would pickup fine and would not misfire.

-after the first session I changed the sparkplugs and closed the gap to .022

-after the second session I closed the gap to .019 and also stretched the springs on the coils to try to get better contact with the plug (recommended by sparktech).

It seems that the car has become increasingly hard to start too.

the car has:
Sparktech non-CDI ignition
NGK BR8ES plugs
Stock FPR
Stock Fuel rail
PTE 880cc injectors
Walboro 255lph fuel pump

Anyone have any ideas as to what it could be?