Ignition coil

Hi I recently had my fuel pump and fuel filter replaced on a 1996 plymouth grand voyager SE 3.3L. Before all this everything was running very smooth, but after I got it back from the mechanic it had very little pull so I asked him what was wrong and he replied that he changed the spark plugs and my cables needed to be replaced. So I had got the cables replaced and still no improvment. Then I had it checked and was told the ignition coil was bad and misfiring from 2 cylinders so I replaced the coil too and still no improvment. So I decided to get the plugs replaced by someone else and they told and showed me that it wasnt firing from the 2 point of the coil so I went immediatly and replaced it and we checked that one and it wasnt firing from the 2 and the 5 so I took that one back and got another one and it is still driving the same way and now im stuck and havent checked wich ones on that one were not firing. Im just about of ideas can you please help me figure this out?