I was on the highway today and the car started hesitating a bit, it gradually got worse to the point where if I pushed the clutch in and let the rpm drop the engine would ocasionally die. I stopped at a gas station and let the car idle, the iddle was surging to 1500 and then almost to stalling. "not at a constant rythm". It only happened at the end of my one hour trip.

My guess is an electrical problem, not sure where. Anyone have any ideas.

 

Hmmm sounds like a vacuum leak after the throttle-body and/or your idle-stabilizer valve is on its way out.

 

DME relay?