Don't sound like an injector problem to me. It is very rare to have injector issues on a 12 valve truck FWIW. You could have several issues resulting in a hard start. Idle speed is critical to a P pumped truck for easy starting. If it is too low, it will require you to push the throttle to make the engine start easily. The truck should idle around 780 rpms when warm (in gear if an auto). The white smoke when cold is usually due to slow injection pump timing. The pumps are not keyed and are only held in place buy a tapered gear and shaft. It is common for the timing to slip and cause smoking and hard starting. I would advise advancing the pump timing to 16* anyways for better performance and mileage. There could also be air entering the low side full system causing hard starts and white smoke. Common areas are rotted rubber fuel lines on rear of the engine, melted or warped fuel heater element, leaking fuel filter or WIF sensor, and rusted fuel lines on top of the fuel tank module. I should add that some of these issues could be hard to find and not necessarily be leaking fuel enough to leak on the ground.