Dtc p0087

My 1.6 tdi won’t start it starts with easy start but when I turn it off it just keep turning over but won’t start.we have had it on Autel elite scanner and can’t find any codes iam getting a fuel pressure low and high and it says some causes is the fuel rail sensor but I’ve changed that and still nothing.When I do start it with the spray it runs ok but sometimes around corners or up a hill it cuts out so I turn it off and bump it and away it goes again I’ve tried everything anybody have any thoughts???