UPDATE: Today I finally got to replacing the ICM. Boom. Fixed the problem. I found the replacement part at O'Rielly's and connected it, started the engine and within a few minutes knew the problem was resolved.
Thank you all for your responses and input.
Ok, I'm special (according to my mom) but I'm not that special. Who else has a 460 motor that hiccups?
The engine runs along fine then a momentary surge of "Go!" and then back to normal. This isn't crazy like I'm holding it back from running into things ... nope, just a quick rev up and then it settles back down.
The mechanic hasn't seen this before and it recently passed smog with super low numbers. There are 68k miles on the engine.
Anyone else have something like this and know where to start on trying to fix this?
Minus this strange quirk it runs like a banshee. Super strong and easily passes trucks when needed.
Thoughts?
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