spark plugs

i was changeing the plugs on my zx2 and there was oil on three of the plugs threds good ammount i cleand them and now there i jus a little amount i was told that the plugs are sapost to have oil on them just bought the car usualy drive the mustang but its a gas hog i now there should not be oil on the plugs i never had a 4cyl 2.0 leater before what could cause the oil on the plugs has 59k miles on it

sounds like it has a bad seal.

valve cover gasket

thanks for the info gowing to chang gasket

Yup, definately the gasket. It runs through the ports for the plugs.