Does this engine have the coils or the distributors?

Some things that come to mind are:

crank position sensor
plugs (i hope you replaced those crappy champions)
wires (if disributor)
coils (if coil engine)
air and vacuum lines on engine
wiring harness

good luck.

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93 300D 2.5 Turbo, Black/Palomino 273K
09 E350 Black/Black 41K