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I agree with both of these as possibilities.
The test for the crank sensor would be to unplug the coil wire from the cap when the problem occurs, and place it over by the LF fender (not ground the end). Crank the engine and see if there's spark. If no spark replace crank sensor, it's gone intermittent.
If there IS spark, replacing the Fuel Pump Relay (PN 3523608) under the right side of the dash is a good bet, and if not done before you need one anyway.
The AMM is a real possibility, just put a new/used 016 AMM into a 90 245 this summer for similar problems. Ultimately it just wouldn't run with it CONNECTED. Ran ok disconnected. Definitely worth a shot- that car had no "Check Engine" code either.
The last trouble spot on the 90 is the computer. ALmost all the original "561" computers have failed by now, and are either "REMAN" (remanufactured) 561, or upgraded to later "951" unit. Certainly one of the things that can do this and worth looking at if none of the other stuff helps.
Sorry you've spent so much for so little results. This is why Volvo-only shops tend to have waiting lists to get in for service.... general practitioners can't know these cars inside out like that.
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Rob Bareiss, New London CT ::: '87 244DL/M47- 234K, '82 245T/M46-182K, '89 244DL/AW70- 212K Not too distant past: 86 244DL 215K, 87 244DL 239K, 88 744GLE 233K, 88 244GL 147K, 91 244 183K
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