My 95 Pontiac GrandPrix with 3.1 is surging. Not bad, VERY subtle. I have no error codes, other than EGR (I know I have a clog) but the surge is under light acceleration, and the EGR shouldn't affect that.
Anyway, I'm gonna try a soak-out of the EGR this weekend if the weather is nice and I can work on the car. For the surge issue, I'm thinking maybe just shotgun with new plugs, and possibly test the wires to see.
Anything else obvious to go for? If plugs don't help, I may just try new wires. As far as I can tell they are original with 135K on them.