As of late my x5 doesnt feel like its accelerating as quickly as it first did when i got it. It could be that im just use to the power now but it feels sorta delayed in the response as well as picking up speed. I do have a very heavy foot i must say..By the way its a 2002 x5 4.4 sports package 87,000KM.

at what KM are the spark plugs suppose to be changed??

Any suggestions on what could be causing this problem.

Thanks