ok i just replaced my spark plugs and i should say that they were long over due for it. when i turned on my car it idled fine for about 30 seconds and then it shot up to about 2200 and kept climbing slowly to about 3100 where it rested for a while until i turned it off. about 1 hour later i came back out to go somewhere and it did the same thing when i started it up only went straight to 3000. so i started driving and i noticed that when its in gear it jerked a little bit(in 1,2,3) and when i pushed in the clutch it would stay at whatever rpm it was at b4 i pushed in the clutch. also it seemed to back down alittle when i would be breaking unless i hit a bump then the rpms would go up and down slightly. wtf is the deal anyone have any clue and could it be the new plugs?????

thanks