Service ASR trouble

[92KNGOHIL]

My bone stock 1992 ZR-1 started stumbling badly after only going about a mile while out for a ride on a recent cool fall morning. At the same time as the stumbling developed the Service ASR light turned on and the Security light in the lower left corner of the instrument cluster started flashing slowly. The car would surge and then cutout, it even stalled a couple of times. I shut the car off and restarted and the problem went away; same thing the next day but this time the problem did not go away. I pulled the codes and here is what I had:
1. CCM code H41
2. ECM code H51
3. ASR code H72
(These were obtained using the ECM ALDL plug from Gordon)

A couple of interesting notes:
1. I always turn off the ASR
2. It does not set a code until the car moves for a couple of minutes

From the manual it appears that I will need a Tech1 and a universal break-out box to trouble shoot the problem any further.

Any advice? PCM? ECM? Bad cable? Other things?

Thanks,
Tim
1992 #446