86 bronco 2 smoking badly

[glasser3]

ok well weve got a 86 bronco 2 with the efi engine and it gets used mostly in the winter to plow and gets light use in the summer mostly so basicly 2 weeks ago when it was last driven everything was fine now today when we took it for a drive it was running fine but it was smoking pretty bad and it was dark black smoke any ideas as to what could cause this?

[Pete33Vt]

Sounds like it could be time for a good tune-up. All that sitting around has probably messed up the works. New plugs wires and gas filter should help.