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200Q stumbling

Well, after removing the hoses from the airbox to turbo, turbo to
intercooler, and intercooler to throttle body. I can find nothing wrong. I
can not get the car to not stumble over 1.2 bar. I took it for another
drive and put my foot down hard at 60 MPH and I did see 1.4 bar but it was
stumbling and running like sh*t. As soon as I eased off the throttle, got
to about half throttle or less. The car picked up like regular. Although
not full boost acceleration. I am lost without a Bentley. I will try to
pinch off the hose to the ECU and see if I get more power. Hopefully I wont
make matters worse.

Thanks to all.
Lorens Kulla
1991 200Q
1985 4KSQ
1995 LHS