I'm with you on the skill set, my friend.
I'd say its earthing out. The problem is techncially best sorted by the old break out box, and checking for the differences in voltages to the 60 pins. Its traditional to assume its the wiring into the ECU/ECM, not the unit itself, and that's the Standard Operation Procedure check.
But I've seen lots of little things go wrong with them, and a quick, easy check is to quickly have it taken out by another, making sure you've got a begged, borrowed or stollen stnd in. Ok, maybee no stollen.
If it were me, I'd ask around for a breakout box. Drop the 60 pin plug, and check the voltages.
But its not me, so your right where
Oberu was when his car kept taking a crap-out on trips.
http://vb.foureyedpride.com/showthre...180792-A9l-ecu
He ended up replacing the A9L ECU wit another one purchased off a forum member.
The capacitors on the replacement one weren't too good either, but it runs and got him sorted.
So network with other CFi-ers, and see if you can get the loadn of a stand in 84 ECU with the same batch code.
Don't worry about the hassles, they recede when you get the basics right.
Anyone here got a spare 1984 GT CFi ECU?
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