[s-cars] Stumble/PowerLoss Redux

[Douglas Fifield]

All,

In my atttempt to repost my plea for help, I seem to have deleted it.
Just goes to show how adled I have become.

To recap, I have a 95.5 S6 (105K miles) that has developed an
annoying, intermittent stumble/loss of power.  I am apealing to the
sacred order for illumination and I come on bended knee.  This is
driving me nuts and certainly takes the pleasure out of driving an
S-car.

Symptoms:
- Stumble during either low RPM startup (like pulling away from a stop
sign) or during cruising conditions where there is very little
throttle being given (could be going 30 or 70).  Often noticed at
about 3K in cruising conditions.
- Almost like a miss or dropped cylinder.
- Don't think it's a POS channel, BTDT and this has gone on too long.
- Replaced fuel pressure regulator and fuel filter
- Replaced plugs and plug connectors
- Tested throttle position sensor per Bentley and that checked out.
- Condition will dissappear spontaneously, or sometimes with rapid
pulsing of the gas pedal (not a sure fire fix).
- Does not appear with a cold engine.
- When warm, will sometimes occur as soon as the engine is turned on.
- When it is present, pressing gas pedal gives little to no
accelleration, just bogs down.
- Running an MTM Stage 1+, Samco hoses, RS2 EM.
- Does not happen at higher RPM's and boost

So, anyone have a suggestion on what I should check?  I sure would
appreciate your thoughts.

D.

-- 
Douglas in MN
95.5 Audi S//6 Avant
73 BMW R60/5 mit Toaster Tank