My xj has recently started to idle low an rough? I'm not sure how to explain it but it sounds like someone reving an engine over and over. I have a some what of a tune up, besides filter , cap and rotor. I don't think either one of them could be it. I read a forum that said Mabey it could be that I have a leakin valve cover gasket an it could leaking on something an causing it to run weird until warned up!! Someone help ! Btw my xj is all stock
