EPS: could be a bunch of things, here's a few to check, no doubt with subsequent input from other Bricksters: Air Mass Meter; throttle body; fuel filter; fuel pump relay; PCV/flame trap system; accordion-hose from airbox/Air Mass Meter to engine: the bottoms of those things are notorious for developing cracks/splits/breaks, which will affect air-flow/vacuum, causing stumbling, usually on the bottom where you can't see it, so you have to remove the whole thing, take it into a dark room, shine a flashlight into it, look for light leaking through the breaks/splits, etc: replace it; fuel pressure regulator; spark plugs, spark plug wires; oil in the distributor; bad battery ground; broken/split/shorting-out wiring harness...want more? GO TO IT, amigo! That should keep you busy for a while. --PD.