Help! Problem With 02 4.6

Discussion in 'SN95 4.6L Mustang Tech' started by JoshYeuh, Nov 24, 2013.

  1. Last night I installed some Moroso 11 bolt Aluminum Valve covers, everything went well I thought. But upon starting the car the idle jumped to 3k rpm and will only go down to about 2k. I have double checked everything and nothing seems to be hooked up wrong. Is it possible I damaged a vacuum line?
    What would cause my 2002 mustang to idle so high?
    Any help would be greatly appreciated!