If yours was an autobox, a search for 'stutter' or 'shutter' would suggest you may need to change your tranny fluid, probably three times.
Since it's a manual tranny, are there no indications from your ENGINE light? Is it working at all?
Pulling the plugs would tell you LOTS, and maybe you'd find the wires are no good, or somebody already replaced them with the wrong brand (Bosch ? )
Do you run injector cleaner (or at least Gasohol) through the tank seasonally ?