Why do i keep having issues after i fix something?!?! OK... In the past couple days this problem has crept up.. The car is fine when i first turn it on.. The idle is right as it should be... but then as i start driving around and it warms up, the rpms are high in every single gear. When i come to a traffic light in drive, the rpms are at 1500 if i switch it into nuetral it goes up to 2000 - 3000, same if i put it in park. I have replaced the throttle position sensor and just replaced the idle air control valve with no change in behavior.. Any ideas where to start looking next? Possible vacuum leak?