92f150soslow

Hey guys and girls, i am new to the forum and in need of some help. For a while now i have had trouble with my 1992 f-150 with the 5.0, it ran ruff at idle but other than that it drove fine except for spark knock upon acceleration, so i changed the cap and rotor, wires were good, changed plugs. have checked distributor and ignition system all is good,fuel pressure is good, fpr is good,Ect good, Air temp sensor is good, but still the same problem. Then i found a couple of vacuum lines that were broke and so i fix and replaced a few of them. now the truck is running real rich, and back firing bad but it drives good. any ideas.

other things that have been replaced on this truck
-IAC
-TPS
-O2
-Map
-speedo sensor

Sorry if this is long but i want to have everything up here that i can think of that i have done,