Reedr125

I have a 1998 chevy venture van, I just replaced the head gaskets and all that goes with it. Van ran fine, but kind flutters when you give it alot of gas. The obd2 gave a code of p1362 Ignition control module (ICM) bypass circuit low. ECM has detected a short to voltage on the IC timing signal. Probable cause short curcuit condition, failed ignition control module, ECM failure. Has anyone ever had this problem? Could it be from sitting before I fixed it? It runs good, just seems like its not getting all its suppose to. I hate to have to spend more money. Any help would be greatly appreciated...