1994 Jetta Gls problems

My car has been backfiriing, Jerking and stalling lately does any one know what may cause this i reaaly need to fix this problem so i need whatever help i can get. Its a 2.0 5 spd

When was the last time you did a tuneup of the ignition components?

i changed my wires and plugs about 2 months ago

How is your ignition coil?

And cap & rotor?

I have a 94 jetta.
my situation.....
when i hook up the car batter to the connectins the fan starts spinning. So i have to leave one unplugged so it wont drain the battery.