A common problem with the glow plug IDI engines from GM(5.7L & 6.2L) and IH/Navistar(6.9L & 7.3L) is that with age, the temeprature sensor starts going bad and they usually short cycle the glowplugs which makes them hard to start when cold. The sensor is in the water jacket part of the intake manifold, screws in about a 3/4" hole, and has about 4 or 5 wires coming out of the plug. It determines the temperature of the coolant and times the glow plugs running time based on the temperature.
These engines run 6 volt plugs on 12 volts so they will heat faster. It the glow plug sensor or the relay sticks it will fry your new glow plugs.
Hard cold starting is usually related to glow plugs or low compression. These engines are very hard to start if all the plugs don't work or they don't stay on long enough. I woud start there and if that doesn't work check the glow plugs themselves, if he used cheap plugs they will go bad in no time.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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