[s-cars] Turbo resetting, lost boost...

[jjmcvay at juno.com]

Help!

I let my cousin borrow my '94 S4 stock except for very recent ECU upgrades (3-bar, Minhea/Robert... woohoo!) for the winter driving school in New Hampshire last weekend after his V8 quattro was out due to a timing belt.  Here is what he says:

"Left your house, cruised along the highway.  As you
had witnessed, the car had boost when I left.  About
20 minutes down 95, I went to pass a car, just fed in
throttle in 5th gear.  Car stumbled heavily - on/off
boost.  For the rest of the ride, car behaved as
normally aspirated 5 cyl - very little if no boost. 
Next morning, car had boost on my way to work.  Boost
all the way through weekend, on ride home again in 5th
gear, fed in throttle and no boost - no stumbling this
time, either.  When I stopped to get gas, shut car
off, after leaving station, car had boost (and for
rest of ride) although I didn't get heavily into the
turbo the entire trip - mostly cruising.  Ray
suggested MAF or crossover pipes, or spark/ignition
issues.  Not sure."

Anybody had a similar experience/advice?  The car goes to the mechanic today or tomorrow.  Is it a pipe collapsing with the new boost?  Seems like the computer resets the engine to drive with low boost?  I drove it with crazy boost maybe 5 times since installing upgrades Dec. 22nd without a hitch.

Thanks,

Jeremy
'94 S4 

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