When the DISA failed I got it out and saw lots of oil sludge. I wiped
some of it, but you really can't get in there.

I get good mileage, 23.2 hwy on regular gas.

The car runs great, just this intermittent hesitation at the line and
the occasional stall. Does seem to be a sensor. I don't have a way
to check codes. Hate to pay $$$ to dealer to find out what they are
spitting out. May have to though.

O2 sensors have never been replaced, car at 204K miles and counting!

thanks for all the input!