Slow motion Audi

[Randy Bindrup <bindy@azstarnet.com>]

I have a '87 5kcstq with 139k miles. I have a problem when trying to 
accelerate under any load condidtion. It will start bucking and coughing 
like it is starving for fuel. It idles smoothly and runs fine under 
*light* acceleration. The in-dash boost gauge still shows 1.3 bar @ full 
throttle (same as always). Here is what I have done so far...replaced 
the fuel pump (was extremely noisy and recommended to be replaced by the 
dealer), replaced the fuel and air filters, ignition tune-up (new wires, 
plugs, cap, rotor), checked all hoses for leaks (IC too) and did vacuum 
test. Checked the idle-WOT switch. Pulled the cat and drove car checking 
for exhaust restriction (raw turbo exhaust! wow, cool sound!). Nothing 
has changed the condition. Could the fuel distrib have problems...the 
air flow sensor plate seems to have no restriction in it's motion. What 
else can I check for? 

Thanks for the help.
Randy