Have a look at the shielded cable to the crank position sensor (cps). Sensor is located on back of block in a flimsy bracket, up high near head gasket edge. It reads the flywheel rim. Cable goes to the upper firewall area where it meets a connector.

Failure of the cps causes intermittent hard starting/no-start, followed by permanent no-start.

Look it up in the 700-900 FAQ under engine sensors. The information there is pretty good. http://www.brickboard.com/FAQ/700-900/EngineSensors.htm

The easiest thing to check is the color of the label on the wire where it runs along the firewall upper edge. The original labels were yellow, the replacements seem to all have white ones. If yours is the original yellow label I'd replace it regardless of symptoms, tests, or condition of the shielded cable. Most of the yellow label ones have by now gone the way of all flesh and I'd expect any remaining ones to fizz out pretty soon.
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Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.