My 1994 Acclaim 3.0L has started missing and occasionally dying. It runs
just fine for seconds to hours, then all of a sudden it will miss once,
*hard*, and the car will lurch; or we'll be at a stop light and it will
die quietly; or accelerating from a stop sign, it will run okay for a
second, then start running very badly for 10 seconds and return to good
operation. Wife says she notices it most when she slows as if to stop for
a light, but the light turns green and she starts to accelerate instead of
stopping; bad running for several seconds.

Don't have a code reader; ignition key trick returned a code 14, MAP sensor
voltage too low or too high. Could that be a red herring? In my experience
MAP sensor problems aren't intermittent, they're either constantly bad,
or constantly flaky.

It's just not talking to me. I have no idea where to start.