At around 2000rpm in 3rd or 4th gear the the car jerks back as if the fuels being cut, the afr jumps round to the red zone 15.5 to 17!
Ive a new fuel regulator and i tried a couple of 3bar map sensors and its still the same.
Any ideas as im scared to drive it now so not to do any damage ?

 

Its a big turbo running greys and doesnt run closed loop.

 

it may be the throttle position then Ste, its not cutting the fuel off when it should, fuel still going in and the car is trying to go.

 

Ive set the tps a few times Dave but its still the same, its as if the fuel is cutting off as the afr goes very lean.
Replaced the tps aswell.

 

Have you pressure tested the system for any leaks ?

 

Gonna check it tonight but i pretty sure its ok, strange that it only happens around 2k off boost.

 

Mine has also developed this problem I am running t34, 83lbs and closed loop. I put it down to tps problem. Its like a small power cut for 1-2 seconds then straight back on.

 

Just found a big air leak by the number 4 cylinder on the inlet.
Finally found the problem well fingers crossed.

 

Thought it was a leak lol

 

Explains the high idle too

 

you never mentioned the high idle lol.

 

No you didnt fuckin naughty boy

 

lol

 

Soz wasnt that high around 1050rpm on a good day

Always thought it was high even though i was told it was ok