Better question is it carburated, tpi, tbi, or efi; if its carburated, here your case.....
it sounds like your first problem is your carbuerator, has the motor been sitting for awhile??? Your plugs being wet comes from either your float(s) in your carb not being set right or your simply pumping it way more than needed to start. It deisels because your in need of a needle and seat, the needle (I believe) has prolly a groove from sitting or is just in need of a change. Next off is the timing, it may be off on the distributor, and needs tweaking.
Bad gas i believe would allow the motor to run but very poorly, might want to take a gander at a new fuel filter also