lots of cranking and then running in limp mode (P8 escos do have limp mode) could be the bottom crank sensor. but more than likely if it hasn't already been done.... the 2 car loom to engine loom multiplugs at the front of the engine, right under the bonnet vent. these get full of water, ocrrode the pins inside and then all sorts of wierd stuff happens. you need to cut these out and solder them together 1 wire at a time and then insulate them , about 2 hrs work.