Firing order and crank position senor -- if you have the coils wired wrong (I'm assuming distributorless igntion) the wrong cylinders are getting spark, it won't run.

If you have a distributor, make sure you have the wires in the right order and the rotor is actually pointed to the correct one (easy to get the dizzy in one tooth off, for intstance).

Otherwise, no spark is a bad crank position sensor or loose wire somewhere.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!