I have an LS170 that is hard starting after sitting for longer than 20 minutes. I checked out the glow plug system and it is working properly. As soon as I start the machine I can shut it off and it starts right up, but if it sits for 20 minutes or longer you have to crank it for a while untill it starts. I thought that the lift pump might have been bleeding off pressure, so I put in a new lift pump, and that didnt help at all. Anyone have any ideas? The previous owner said the engine has a miss, and he found a stuck plunger in the injection pump. Could he have messed something up in there? I was also wondering if maybe the fuel solenoid isnt always working properly??