I have a 93 Bonneville SE and early today it started running poorly on my way home. Last weekend I did a tuneup on the car. I changed the plugs, wires, air filter, oil, and oil filter. The car ran great all week then today all of the sudden it started acting funny. The car starts bucking/surging around 2000 rpm. The tach kept jumping and the car bucked/surged, but did not stall. It did this when I was on level ground and going up hills. Going down hill it did not do it. I'm thinking it could be the fuel filter or a clogged catalytic converter. Any other ideas?