My '84 (1.9L engine) had been running just fine until this morning.  I
hadn't used van since Friday.  First mile was okay, then when I went to
accelerate from traffic light, engine was rough under light throttle.  After
I left work this afternoon, I filled tank with Chevron 93 octane instead of
usual Exxon stuff.  Possibly some improvement.  Has anyone had similar
experience?  I only have a limited amount of time on weekday evenings to do
troubleshooting.  Rotor, cap, wires, 13 months old; plugs, injectors, Temp
II, 2 years old.

John Lauterbach
Macon, GA