need help! holding the pedal at about 1500 rpm in park the tack will go up and down, it does it driving at lower speeds too, already replaced a lot of new parts. thanks

 

Yours doing something similar to this??

http://www.youtube.com/watch?v=aOOvp..._order&list=UL

 

A/C compressor kicking on & off?

 

Disconnect IAC, still do it?

 

throttle position sensor or idle air control valve maybe?? might want to go more into detail about lots of new parts