underneath your distributor there a thing called the "HEP" Hall-Effect Pickup. they go bad, and you are screwed. you may be able to find a use-able one at u wrench it or something like that. or get one new.

that is the pickup under the distributor that fc735 is talking about. they are notorious for going out.

hope this helps.

and check out www.turbododge.com its a great site and lots of help from the dudes over there.