FC lagging @ 6500rpm...
 

like it says.. its jumps back and forth.... just like an idling noise... i dont know why it wont reach 8000rpm? any questions?

give me details / last 3 day history / buy cheep gas? ETC. / is car turbo?

Probably bad spark plugs or spark plug cables if it runs fine below 6500

Have you changed the fuel filter recently?

hmmm i'll check out the sparks plug wires and the sparks plug... and its not turbo.. its n/a... how could it be the fuel filter tho?

cause it could be full of crap causing it to not flow enough fuel for the higher RPM....

Possible causes: Fuel filter, clogged cats (if you have them), spark plugs/cables, old gas, dirty air-filter, plugged charcoal canister (lol), foot isn't heavy enough.