Hi car is an 83 pontiac firebird 2.8 carb 5 speed

the problem is that when i'm driving the car will bog out and seem to misfire....i'm doin 80 kph and about 1700 rpm

then the car will seem to misfire cannot open it up just seems to jerk like plugs are not firing sometimes will stall......have to pump gas to sorta clear it out but then will still bog out when i try put it in gear and give it some gas
any ideas??
changed the plugs and still does the same thing plug 6 had excess oil on it....what does that mean??

 

have you tried trouble shooting it or just changed the plugs? might be a good idea to give that a try. dead wires? clogged filters or cat, run compression or leak down test.scan it for codes?