[urq] suddenly lean again and some measurements

[SpotatAshleys]

Hapy New Year everyone. I hope so anyway.
My first request for help of 2007....
Can anyone with lots of spare bits or undergoing a rebuild supply me withthe following measurements please ? -

#1
Internal diameter of each end of the turbo to intercooler hose.
Internal diameter of each end of the intercooler to throttle body hose.
Internal diameter of the "elephants trunk" piece of the I/C to T/B hose that goes to the auxillary air valve 
Vehicle is stock '87 WR.

Many thanks

#2
 Sometime last year I had a problem that I asked for help on but I regretfully did not keep the replies and the problem went away and I never found out a cause. Well it has started again. The symptoms are as follows:

If I accellerate hard in any gear it pulls like a train and the air fuel meter shows (as expected and desired) a rich mixture. When I lift off , change up and re-apply the accellerator the power has gone and the mixture has gone lean. If I were to keep my foot down this condition would remain. If I lift off and then reapply the accellerator then the power returns, the mixture returns to rich and it would  continue to pull until I ran out of revs. If I keep my foot down instead of changing up the mixture remains rich so it does not appear to be a case of fuel starvation. (The sediment trap upstream of the fuel filter is clear as can be anyway). I have removed the "igloo" and looked at the airflow meter flap and there is no indication that this sticks in any way - seems to be free to move. The injectors were new about 2 years ago as were the injector seals. The injectors are held in place with a steel injector bracket from a non-turbo coupe quattro and can not move. I have not fould any holes or splits in any inlet hoses but as you can tell from query #1 I am intending to replace all these. The turbo seems in fine condition, never a hint of smoke and was checked for end play when the engine was rebuilt about 3 years ago.
It only ever happens when warm but this is because I never accellerate hard until it is properly warm.
Any ideas? Like I said, it occurred before and went away so I never found out the cause.
Look forward to receiving any suggestions.

All the best

Keith

'87 WR
'63 Daimler V8