Hi Guys,

So I've got an issue with my truck its a 98 non turbo, so when i start her she runs really rough then after a while clears.
when i open the throttle fully she starts to miss and also chucks out blue smoke coupled with a large loss in power.
so I've taken the injectors out given them a clean and I've tried to check diesel pressure but cant seem to get diesel to squirt out from the pipes attaching to injectors? should it?
when i first brought it one of the rockers had broken and i replaced it so maybe the valve seals no good now and leaking oil into bore?

any ideas as im new to diesel engines? cheers!