My 1991 2.3 9000T stalls at speed or when I try to accelerate going down the
road or from a stoplight. After it stalls, restarting is very difficult,
often taking about 5 minutes of cranking attempts. After it restarts, the
engine will then run for awhile and sometimes stumble and stall again. The
problem doesn't seem as severe while the engine is cold.
So far I have replaced the spark plugs and the DI cassette and checked the
lines to the APC valve to make sure they are still intact (connected and
without cracks). I also noticed that the APC gage no longer moves out of
the green zone.
Any suggestions on specific items to check or where to look are appreciated.