Before I buy a FSM, I figured I should ask here if anyone's got a pin-out of an '84 truck's computer/Emission Control/ECM. The '84 is year specific, and not an '85 or '83. They just ain't the same.
It's a 21 pin ECM:
here is what i found straight out of the 84 FSM. Both are from the same page i just zoomed in on the pin out. I happen to notice that the emission cont. unit was on this page, it was only by chance. i looked through all related sections and this was the ONLY thing listed