I believe that surging problem is the same as the problem I'm having where the car acts like a spark plug wire is grounding out. Well any way try this under the hood is what is called a pressure relief solinoid it's blue and it's with the two sets of plugs on the drivers side of the manifold. On my car if you unplug this solinoid and plug it back in my car will run normal for a few days as soon as I'm over my current ailment I am going to check it for functioning and vaccum leaks. any advice is welcome and I hope this helps some people

 

I have the exact same problem.

Stupid blue solinoid.

 

I dont have any selenoids left, and I still have surging.

Yours may have been associated with that, but im sure the rest of us with emissions removed, im positive that its timing associated now. Thats the only thing I have not fixed in this goddamn car, and if thats not it, I'll be very close to freaking the hell out!