Puttering from my 2002 Ford Focus

[tazymnm]

I'm pretty much at my wits end.
And I don't have the money to take it to a shop.
When I try to accelerate there is a REALLY bad hesitation/puttering that causes the car to jerk. It happens at all times at different speeds. I was told that it could be my O2 Sensor or/both Cadalitic Converter.

I've changed the ...
-Fuel Filter
-Spark Plugs and Wires
(when I did this, the puttering got MUCH worse, so I'm going to change
back to the old ones for now)
-Air Filter
-about to change the PCV valve

ANY HELP OR INPUT WOULD BE GREATLY APPRECIATED.

[Davescort97]

You mentioned you had replaced the plugs and wires. It sounds like you got two plug wires on the wrong cylinders. The cylinders are from the left facing the engine. 1-4. The plug wire for the no. cylinder is on the bottom right of the coil block. The 2 3 and 4 are counter clockwise from the no. 1 position.