Yesterday car seemed to run fantastic, smooth idle, plenty of power, etc. SES was on. Today, SES turns off and it's back to a rough idle and had a hard time starting once. I just bought the intake manifold gaskets, so I think I am going to go ahead and change them, just so I know they have been changed and I can see the inside of the engine to get an idea of what kind of shape its in. Also put a new gas cap on just to make sure it wasn't the cause of the P0440 code I got randomly. Old gas cap looked pretty bad.
