Hey Guys
Im new around these parts so be gentle

Ive recently bought a Mk4 Golf Gti 180 - and since had it stage1 remapped, car pulls like a train, but occasionally i get flat spots.. feels like its missfiring or not getting enough fuel, Ive had new plugs, new coilpacks, its just had a full service, Cam belt + water pump has been done in the last 3k miles. VAGCOM doesnt show any error codes at all.. im really at a loss!

Mods:
Forge Splitter
Silicone Intake
K&N Air Filter
Its an 03 Plate has about 80k miles on, full service history and has been well looked after..
Any Help would be greatly appriciated
Cheers
Chris