Tom,
When you mentioned the truck was hard starting, you didn't mentioned anything about the timing. With the 186K miles you have on the engine, are you still using the stock timing chain. These stretch over a period of time and will affect the timing. This can be partially compensated for by periodically adjusting the pump timing but eventually the crank and cam are so far out of time that there are noticible power losses. A very small adjustment of the pump can make a difference on how well the truck starts.
TimK
85\' GMC Sub, 4x4, 3/4Ton, 6.2L Diesel<br />67\' Land Rover Series 2A, 2.5L Diesel<br />00\' VW Beetle, 1.9L Diesel TDI <br />90\' Range Rover - soon to be Diesel<p>So what do you do with gelled Diesel fuel? Smear it on toast and have another cup of coffee until it gets warmer outside.