FYI,you can purchase an ECU for around $40 at eBay
Link
HERE
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The weakest link in the PCM is the electrolytic capacitors.
After 10 years of 140F+ heat,these electrolytic capacitor will leak.
GM / AC Delco make many versions of the ECU,some are epoxy fill and some can be service.
The only way is to open up the PCM cover and check.
I strongly recommend you to do a swap instead of repairing it.
Base on pass experience you will need 4+ capacitors and good 1 1/2 to 2 hours of your time,
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