throttle/frequency valve sticking

[Delorean17@xxxx]

Hello,
I have a little problem here. When I drive my car and shift the RPMs go 
way up like I still have my foot on the gas but I don't. I have to put it in 
2nd and brake until it gets back down to lower RPMS, and then release the 
clutch to get the RPMS back down somewhat. Messing with the gas pedal doesnt 
help. The linkage is not the problem. I can remove the linkage to the 
butterfly so it is closed but it still idles very high. Once I shut the car 
off and start it back up without touching the gas it will idle low like it 
should again.
I am curious as what this could be. I just had all of the vacuum lines 
replaced last week. also, my 02 sensor is very bad I was told, the wire is 
almost completely bare. I have a new sensor but I cant get the old one out; 
what is the trick? could this cause my car to rev up so high while changing 
gears?, I didnt think the frequency valve could make the engine rev up to 
near 3500RPMS. Also, the dealer said he adjusted the idle on my car, I know 
its electronically controlled so I turned the screw back in all the way, is 
there anything else he could have adjusted that would cause the problem I 
described? any help would be GREATLY appreciated.

Car hasnt been driven since 1993 and just getting it ready for the road 
again.
Thanks
David