I have a similar problem. If your coil(stock)is like mine, you might have purchased the wrong aftermarket coil.
The fact is, noone makes a direct plug-in aftermarket performance coil for the '84 2.5l. Believe me I looooked!
Problem is, the later year ext. coils were using the gm dual connector. The 84 on the otherhand uses a 4 bladed male connection. It is also slightly larger in size.
After many calls and repeated trips to 3 different speed shops, I went with the MSD Blaster SS coil(pn 8200). It is universal and has two terminals....+ and -. It should be easy to wire up but.....
Nobody on this list(so far) can give me a straight answer on which wires from the harness go to the + and - terminals.
The heavy primary lead is a no brainer. +
The tach filter lead...???
The radio cap. lead from the distributor..???
And of course the scary one, the wire to the electronic module in the distributor..?????
Mayb somebody can help now. They didn't seem to know when I posted a similar thread a while back.
harlie