Car starts, idles, but will not rev under any load.
It will rev in Park or Neutral, but put it in gear and push down on the gas pedal and it will stutter and stall and will not move. Fuel pressure is good (65 psi at all rpm), exhaust is clear (i.e., no blockages). Fuel quality is unknown, but it was running good, then started doing this and died--and not right after filling up with gas. So... electrical or related to electrical? If it was a car with a distributor and points, I'd say the distributor wasn't advancing.