Low Idle '98 A4 2.8 AWH

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'98 2.8 AWH 5-speed
Just got thru replacing the ignition switch in order  to get the load 
reduction relay to work, turned out to be only a bad connection  someplace in the 
steering column, anyway everything works fine now except the  car wants to 
idle at 500 once it is warm. 
In my attempt to diagnose the  problem with the load reduction relay I 
pretty much pushed, pulled and plugged  back in every relay & fuse under the 
dash. The only thing I did under the  hood was disconnect the battery (the 
battery was disconnected for about 3  days).
Once warm if you rev the motor it will drop to 400 come up to 500 and  
during the next 20 seconds will climb to just under 800 and stay there. If you  
are coming down a freeway off ramp and just leave it in 5th until it's time 
to  push in the clutch at the stop sign, the motor  will die.
 
Where do I start?
Thanks,
Jim

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