Thanks guys, I found it. Not real easy to get to, but not as bad as some things I have found on this car. Wanted to know where it is because I have experienced the "high idle hell" once earlier this year, then it simply went away the next time I drove the car and has not returned, but I know it is there, and my wife will never trust it again for a road trip until I have remedied the situation. I hate trying to fix something that is working fine
Anyway, I started fiddling yesterday and disconnected the power to the idle air valve (slide valve) which of course caused the high idle, then re-connected it and it started running like crap. No amount of disconnecting/re-connecting helped. Well I obviously messed something up, but what! I checked the OVP relay to see if maybe I blew the 10A fuse, but everything "looks" good.
I have taken the idle air valve off now and am soaking it in carb cleaner and will re-assemble and see if it is still running badly. It is no longer a high idle problem, it is just a bad running problem. I will probably be asking a bunch of questions as I eliminate what it is not.
I have ordered new vaccum fittings around the valve for starts, and will replace the OVP relay, because so many people have had trouble with it. The idle air valve is an expensive bugger, so I am soaking. It does seem to open and close with external 12V put to it, so I am assuming it is OK.
I hate mysteries!