Miss fire and the fule smells rich

I bought a 1994 Ford Thunderbird 4.6L V8 knowing it has a blown had gasket and smokes like a chimney. I put some stop leak in the coolant resolver and that helped tremendously. I will be replacing it soon but its a temporary fix for now. The real problem is its missing when its idling, when its over 3000 rpm's it stops with the missing issue, I also replaced the spark plugs. The exhaust smells rich and one of the spark plugs is wet and having a gas smell to it when I pull it out. I think its cylinder six with that wet plug issue. I thought it might be a stuck open fule injector. Do you have any ideas on what the issue may be?