Hi
When I took my van to the mechanic yesterday, everything was running
fine. I had told him that the van was somewhat lasy but his check up did
not reveal any concerns. Then the van ran smoothly for the rest of the
day.
The lack of power that I am talking about below, really started  to get
worse today and makes me wandering if during the check up he would have
unplugged some kind of sensor and forgot to plug it back properly.
Anyway, here are the symptoms: .when warm and stopped at a red light for
instance, it is sometimes slow to move forward when light turns green,
in spite of me having the pedal almost entirely depressed. For a moment,
there is no power and then a sudden surge of power...and this goes on
and off until I shift in the 3rd gear. I don't know yet if this lack of
power also happens when cold. This lack of power happens mainly in 1st
and 2nd gear but will also happens occasionnally in 3rd gear.
The fuel filter seems to have been changed recently...O2 was also
changed.

Could it be the fuel pump? spark plugs (a bit black but have been
changed less than a year ago...)... Should I add some fuel injectors
cleaners in my gas tank? Any suggestions appreciated.
Thank you very much

Alain Thibault
Vancouver, BC
Westfalia 1991