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Obviously check the coil wire and any other loose connections under the hood and in the fusebox.
THe fuses must be good, but can be intermittent.
Most definitely replace the RPM sensor. Carefully extract the old one from the bellhousing bracket. Douse it with silicone spray if you can't get it out of there (engine cold) and wiggle it gently until it comes out. Break the bracket and you're up the creek. That part is SO inexpensive compared to the engine's total dependence on it, that it would be silly not to. You'll probably find the old one fouled with debris and corrosion.
If that isnt' the culprit, often the fuel pump relay is the one. On a 91, you should be able to hear that one click (and the fuel pump run for a second or two) when you turn the key from OFF to ON, before starting. If it doesn't do that while you're stalled out, it could be the problem.
Power stage is possible as well. Can be intermittent. I'd follow the first two as the most likely, then go on to the power stage. You can even pull the RPM sensor and LOOK at the thing before deciding to replace it. A good one should be clean and not corroded. Wire should be intact, no splits in the insulation.
The fuel pump shouldn't work intermittently as a fault of the pump itself.
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Chris Herbst, near Chicago, IL. 93 940, 91 240, 90 240, 88 740, 87 240
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