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...it was loose bolts, all of them, holding the CPS in place. Getting to the pivot bolt behing the trigger wheel was a bitch. I had to unbolt the A/C compressor to get enough room - also a bitch.
And all I had to do is search this forum for which things to check!
So what was the surging like?
Mine surges too. Partial, steady throttle at a steady speed. 200 RPM variation...surges.
My surging was fixed with a new 02 sensor. Don't be a fool though and pay $90 like I did.
It recently started to surge badly going up a ~15% grade at 40-50 MPH. It always did it on the highway as well, but only noticeable enough to be annoying.
Since the latter is typically a symptom of a failing O2 sensor, I replaced that first. (According to the records, it had never been changed)
That wasn't it.
I then tested the TPS and found the part throttle contact to be intermittant. It just sat there on my workbench, connected to an ohmmeter, fluctuating. I replaced that next. (According to the records, it had never been changed)
That wasn't it.
So I searched this website for "surging". The gap appeared to be within spec but when I checked the bolts, all three were loose.
THAT was it.
I don't feel I've wasted any money replacing the O2 & TPS sensors because they were both bad, and I was doing a major tune-up anyway.