lag an splutters
 

hi my car feels like its holdin bak for the 1st 3k then it clears and gos really well ???can it be a spark plug ??? but tick over is great does not miss a beat

Checked your coil packs ? For damage

Cracks an breaks that kind of thing ??

Yeah check the leads too - if it was fine to 3000 then died off would say ecu you in safe mode - if you get no joy with the coils and leads try an ecu test and reset

How do I reset it ?

You can leave the battery off for a couple of hours but the best way is with the black and green plugs under the dash that way you can read your fault codes if you have any type ecu reset into the search on here it should come up or try jolly green monsters website he has a guide on there if i remember right