Something fuel/spark is wrong with my car.. ideas???

Ive done a sparkplug change and every plug's tip is bright white.

The problems i have are.. Occasionally, if i give it more then half throttle, the car will spudder and not want to go anywhere.. Most of the time this happens, sometimes it dont.. It mostly does it when the car heats up rather then driving when cold.. Any suggestions to look into??
 
pulled codes yet? things to check out first (to me) with no other info are: the TPS and fuel pressure at higher RPM's.