[IONcannonPewpew]

Ok so I've had this 06 RL for 2 maybe 3 months now and been having problems with it ever sense I've bought the thing, I only know of one mod to the car but for the rest I don't know... The guy before me was a newb I believe because I'm sure he didn't poperly upgrade the car, I'm not poor but I'm good enough to know when a car is running funny and when its time for a change. There is a 2.7" pulley on the car for sure, for the rest of the mods (supporting mods) I don't think they exist so I have 2 choices, upgrade the car so it can handle the pulley or downgrade the car a bit so it runs normal again. The car idles at 850-900rpms (not sure if thats normal for this car) and other stuff is going on with it, my question is what is easier or better thing to do, upgrade or downgrade. If upgrade what supporting mods should I get? With lots of reading it seems injectors would support the pulley, a H/E since the charger will be running hotter, I thought about CAI but from enough reading the stock intake is just about the same as a CAI when it comes to numbers... Any opinions?

(not the richest guy btw)