Im having a miss with my 4.0 when you first give it gas and some times it want start unless you hold it to the floor. I also think it idles high too. It idles around 1500 to 2000 rpm's. Does anybody have any ideas or hints what might be wrong?

 

it sounds like a major vacuum leak.

 

engine light on?

 

Yeah it is but I cant figure it out.

 

do you have a code reader?