Ok, here it is peoples. I have an 02 ls with 72000 miles on it. I have always kept up with my oil changes, I use Royal Purple oil. Now I haven't done my transmission flush, nor changed my spark plugs or coolant, and I didn't do an fuel filter change. Now I'm noticing some problems going on as far as when my car has warmed up and is idling the idle goes down like something drew power from the engine then goes back up. Also when I hit the highway and floor my ls I'm aware of the delay, BUT when its gaining its speed it like stutters. So I dont know where thats coming from. those are the 2 major things I have in my ls. So I'm asking what measures should I take to get my car running right again? Thanks for the help.