my 94 sts idle up and down for about 3-5 minute then it normal, well i bought the car from a freind and the muffler is not weld on, it has a clamp on it could that be the problem? and it also read "service ride control" what does that mean? any help would be appreacate

 

Check for codes, Idle may need re-learned.

 

how do i check the code?