All,

Trying to help a buddy out with a strange issue. His 87 2.1 westy wont stay
running longer than a minute or two. It runs pretty good, then slowly
starts to hesitate and eventually die after a minute or two. We can then
immediately start it right back up and repeat. very strange, we are stumped.

What we have already tried:
Grounds are clean
Temp sensors and oil pressure sensors( new o2 sensor going in this weekend)
entire ignition system is good (timing, coil, distributor, relays, etc.).
fuel pressure is good. All injectors appear to be functioning good.
AFM is good
throttle switch is adjusted good
idle control valve and module are both good
ECU is good
the purple and white vacuum lines appear to both be leak free

With fuel and spark both good, it must be some kind of electronic issue or
air leak, yeah? We are stumped... looking for any ideas.
Kevin