ok so i was driving my car down the freeway today and pushed in the clutch and my rpm's dropped very fast down to about 500 or so then picked back up then dropped to about 200 rpm then evened out i didnt think much of it but then when i went to start my car later it was struggling to idle and the idle was jumping around, but then when i drive the car for a minute it stopped. The car has felt a little down on power to. What could this be? i havent checked anything as of yet. Any help is appreciated.