Mark, one thing I wonder about is your ECU. If it's original it may be one of a batch of ECUs that are failing about now, due to a poorly-designed circuit that's insulated with silicone which breaks down over time. Did you mention that your gas mileage has been bad lately? That's one of the symptoms, along with failure to provide a signal to the fuel pump relay. Check the Bosch part# on your ECU. If the last three digits begin with a 5, it's probably going to pack in soon. Make a few excursions to junkyards or Ebay, looking for an ECU to match your car (ie, turbo or NA, EGR or no EGR) with the 3 ending digits beginning with 9, such as 933. Just a thought. As for the crank sensor, if it's been replaced recently there's no reason to expect it's bad. Have you checked for any fault codes? If you don't know how, it's explained in the FAQs, same as 700/900 series with LH2.4.
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Chris, Dartmouth NS Canada 70 M-B 280SE, 83 245DL, 84 244 turbo, 90 780 turbo, 92 VW Golf