89 190e 2.6 starts great and idles when cold. However, once the engine reaches operating temperature and is shut down, it is very difficult to restart and keep idling long enough to put it into gear. If you can get it into gear, it will then drive fine until you come to a stop - where it will idle rough an/or stall. If you keep your foot on the gas and keep rpm's at 1,200 or so it will keep running fine. I am thinking that this is a OVP problem or maybe an oxygen sensor gone bad. Any thoughts?