wha type of mufflers do i need?

Discussion in 'SN95 4.6L Mustang Tech' started by stanford20, Dec 16, 2003.

  1. idled up 2004 gt check engine light on

    i heard a 01 that was idled up and loved so today i found out how too. not hard just turn a screw a couple of times. anyways after cranking the car bout 4 or 5 times while i was going down the road the check engine light came on. it idles at about 2 grand and drops to bout 1100 after 7 -10 secs. also when letting off the gas while coming to a stop the rpms go back and forth from 1100 to 1900 then eventually stops at 1900-2000. can anything go wrong?is it hurting anything?