Re: 200q stumbling/hesitation

[mallick@NetHeaven.com (John and Barbara Mallick)]

I had similar problems with my car.  Finally tracked it down to the vacuum hose
which feeds the turbo bypass valve.  While I was at it, I pulled the bypass
valve out and flushed it with WD40 and some Teflon based oil, then cycled it
a few times by applying 12Vdc to the terminals.  

I also found a poor connection at the mass flow sensor.  One of the gold
pins in the connector would get pushed back into the connector body when the
connector was pushed onto the sensor.  Pulling the pin out from the rear
connector, bending the "entrapment" clip a bit and refitting it to the
connector body solved that problem.

Good hunting.

John Mallick 
'91 200q