You have so many possibilities .I would start with the wiring to the distributor ,is the distributor the correct part number with the ECM ? Tell me also where you found the information to guide you ? You said that the distributor was modified ?What did you do to it ?If you want a faster answer try calling street and performance at 479-394-5711 ask for Mark he will point you in the correct direction .Also give me more information I will help also.
