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When the I6 in the truck doesn't want to start after sitting for a good bit, a hefty squirt of starter fluid always does the job. If that doesn't work, in addition to the above suggestions, double check the firing order of the spark plug wires, make sure the points are good, and if you have an HEI, they can go bad right out of the box. Under long shots, if it's an HEI, make sure the resistor wire has been replaced. Good luck and let us know how this works out.