You might try one of the links on Jim F.'s page:
He has links for DTC's on on the Distributor Ignition Module and the Diagnostic Module.
If you're not sure, try e-mailing him. He's a frequent contributor to this site.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".