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On the driverside firewall is first place I would look
The 1986 Firebird came with either a 2.8L V6 or a 5.0L V8
1986 Pontiac Firebird 2.8 Liter Firing Order
The 1986 Pontiac Firebird fan relay switch can be found on the back of the fan motor. The relay switch is connected to the fan motor by two retaining screws.
Yes
The timing should be 8 degrees
try a CHILTON BOOK with wiring diagrams
I do belive its the same as the 1985.It would be 123456
At or near the power steering pump.
timing is adjusted by the ignition module and feed back from sensors
6 cylinder=.045 8 cylinder=.045
there may be a problem with the torque converter or there is a short in a wire some where