Since you commented on the little buttons leaving their posts, I'm assuming you have the newer style system with the mono valve. The old Chrysler had more obedient buttons. It could be the ECU or the mono valve or the push button unit or a vacuum problem. You are going to have to do some diagnostics or spend a bundle on an Easter egg hunt. I don't know where to begin to help you on the computer. Perhaps one of the other techs has written up a procedure.

Good luck,
Peter

__________________
Auto Zentral Ltd.