Can someone help me when I put my foot down the car stutters at 3 to 4 thousand revs then suddenly goes?
And when I turn the boost up it stutters right thru the revs its like it wants to go but it can’t

HT Leads??

someone i know has this problem on a Lotus Elan, they put their foot down, the car goes-stops-goes-stops-goes etc, its like hitting a fuel cut.

but then again if its just happening between 3-4k then not too sure

Have you played with the boost at all?

Could be a leak in an actuator pipe which is over boosting initially before settling down.

Could be a boost leak in the turbo to inlet pipes, or it could be plugs

I took the boost controller of to do the gear box it had small zip ties holding the hoses on but I didn’t put them back on (as I didn’t have any)

Do you have a boost gauge fitted to know if it is overboosting and hitting fuel cut?

yes iv got 2 boost gauges 1 std 1 blitz and its not over boosting

Try bypassing the boost controller, it might be a dodgy solenoid or next cheapest option would be chance the plugs, if your getting a weak spark to start with higher boost will kill it totally, it sounds like its happening right when your boost is coming in.

Another thought, your not using 95ron fuel are you? I had to use 95 in Cumbria in a mildly tuned b4 legacy and it miss fired and hesitated under any load.

no i use optimax and yes it stutters just as it starts to boost

Definately an airleak. Might be difficult, but get your head under the bonnet and open the throttle and listen for hissing.

iv just got a pdf on how my boost controler is fitted i think it might be wrong so i will check it tomorow and for hissing
:go:

Some twit (not me) had put the boost hoses on the solenoid the wrong way round
Its boosting better now but I’m getting fuel cut as I’m running 14 psi (I didn’t notice as my boost controller isn’t in psi)