Also, the svc advisor suggested upping the idle to make it run smoother--but the "tech" said it was in the range it was supposed to be (750-800 from memory). I told him I thought it could be the computer. I know enough about cars to frustrate myself--my dad was a svc advisor for Cadillac back when they had to diagnose the problems and not depend on a computer to tell them what was wrong. I have made other suggestions like an idle sensor--he said computer would tell that. Could it be fuel pump, trash in fuel line, PCV valve? I am so frustrated.