Here is what I found elsewhere
I looked those up on "Alldata" and sure enough it sounds like what could be giving me fits. They say
The Idle Validation Switch (IVS) provides the powertrain control module (PCM ) with a redundant signal to verify when the accelerator pedal and shaft is in the idle position. Any detected malfunction of the idle validation switch (IVS ) will illuminate the Check Engine Light and the engine will operate at low idle only.
The TPS is probably sending a conflicting signal which explains why there is no check light till I depress the pedal.
Might have something to do with the temperatures since I haven't had problems during the warmer months but last year it did the same thing a few times.
These have been the main issues I have found in this forum, if they are both on the pedal, then you covered that base already. I tried mine again today and like other people, once it warmed up for approx 3 minutes it went to working fine with normal throttle response. This seems like a typical corrosion response to me but I may never find it. I am going to try a new TPS and see if that works. No fuses were bad. Unless there is a sticky relay in this circut it will be like a needle in a haystack. Others cured this by simply cleaning the connections in the wire harness.
Last edited by grassfarms; 01-08-2010 at 01:33 PM.