Flat spot at 3000rpm

[letmeindammit]

Hey guys

A friends VL non-turbo straight six has a flat spot when you hit about 3000rpm in the throttle when accelerating. I'm not very cluey on VL motors, give me a 308 any day, but before i start pulling things apart does anyone have any experience as to what the fault could be?

My two guesses are dirty injectors or a problem with the crank angle sensor. If you think it is the crank angle sensor, what would the fault be with it, and what's the remedy?

Thanks in advance

 

[Bax]

Yeah it could be what you've said, as normally 3k is usually where it starts pulling like a madaxe.