Hate to be a broken record here but if I were you
I'd change out that old distributer cap and rotor. my mint 88 sat covered in a garage for 8+ mo. and had run perfectly. The first start was a backfire from the AFM area, racket, them wouldn't start/run. Went down the entire checklist but avoided the dizzy cap and rotor(kind of a hassle) New AFM, new ecu, new relays fuses (ALL), new air boot, new plugs, wires,.......finally opened the cap and found a nice coat of moisture inside the cap and the contacts...2 years old....rotting and useless. Replaced with Bosch...started right up...oh...and with a perfect idle, which most E28s don't seem to have. Very happy.