Well yesterday I wen`t to start the truck and I had to crank and crank, it would fire but not catch. No pedal, some pedal, full pedal, didn`t seem to matter much allthough it did finally start with full pedal. I checked all the glowplug wires and randomly pulled the glow plugs and checked 5 of them with a 6 amp battery charger and after 15 mississippi`s I`d get about 1/3 glowing from the tip down. Everything seems to be working that way, once it`s fired up you can shut it down, then fire it right up no problem, even leave it for 3 or 4 hours and it will still start right up...a bit more cranking though. Even hitting the glows while cranking still doesn`t seem to help....almost like the glows aren`t working. I have the clear tube on the return line, no bubbles while running, but when I check it in the morning there seems to be one bubble right at the apex of the line curve......any suggestions ?:(

High idle and/or cold advance not working?