87 5kTQ stalling

[JJK1204 at aol.com]

Our 87 5kTQ has been stalling and exhibiting other strange behavior. It 
started about a month ago when it did not want to idle in the morning until 
it was warmed up, which later progressed to it didn't want to idle when warm 
and the alternator was putting out, ie; with the headlights and rear window 
defogger working. I put in a bottle of Techron, doesn't that fix everything? 
No, apparently not. I had driven a few miles to drop off my wife to ride her 
horse and was to pick her up in 45 minutes. After sitting for the 45 minutes 
I drove to get her and the car stalled at a stop light. It would fire and 
then die when I started to pull away. It did this for a couple of minutes and 
then fired up. I drove home switched cars and went and got my wife. She 
didn't drive the car for a few days and I could find nothing wrong and could 
not reproduce any of the problems. So a day or two later I was going to take 
the car to an Alfa Romeo meeting about an hour away, I guess I really pissed 
off the Audi gods since I got two miles from home and the car stalled on the 
ramp to the tollway. It would catch but would not keep running a couple of 
times and then no catch at all, no codes then or previous or now. I had to 
tow it home. I was busy all week so today I took it out and almost everything 
was fine except for when I punched it the boost would climb to 1.2-1.3 bar 
and then around 4500 rpm would start to decrease to 0.9-0.8 bar. This makes 
me suspect the Michelin Man hose or some other intake air leak, but I 
replaced the Michelin Man hose around a year ago. I also replaced the right 
front mount, exhaust manifold and intake manifold and the Michelin Man hose 
looked fine. Any other ideas?

Thanks in advance,

John Katos
West Dundee, IL