high idel speed

What is your question?

My 06 jetta will idel at 1300 rpm's and when i go to shift gears and push in the clutch and let off gas the idel stays at whatever rpm's I shift at, so If I go to shift at 3000 rpm' into 3rd the idel speed stays at 3000 while the clutch is in.and if i am sitting still and rev the engine to 2500 rpm's it will stay at 2500 for about 5 to 8 seconds and then drop back only to 1400 rpm's... Can someone please help me!!!

What makes this problem better or worse?

It gets worse when it heats up..

How long has your 2006 Volkswagen Jetta had this problem?

A few weeks