could it be the spark plugs?

 

well, i went back out and starte it up this morning, everything seems to be working just fine. ill keep this updated in case something else happens agian

 

interesting problem....my car does somehting like that too.....but the only time it happes is when i come down the hill to my house...it will idle to 1500 then drop to liek 600 then go up and down till i park and it will stay reved at 1500....its weird