Hey guys apologies if this has come up before . Back story . Ive changed plugs,leads, adjusted timing 15d BTDC done the dizzy and rotor button cylinder 1 Checked resistance on injectors all.avg 3 ohms The car takes of alright maybe a little hesitation .but massively struggle to.get over 4000rpm surging. ?? any help would.be appreciated Thanks apologies again if this has come up before

Any leaks in the intake after the AFM? Faulty AFM? Crank Angle Sensor? They'd be next on my list, but could be pretty much anything. Try searching the forum as I'm pretty sure this comes up frequently.