Truck is hard to start and Emits smoke while starting?

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Very common problem,faced by many car/truck users.
I have seen two different problems with symptoms like this.
1. A leaking injector. If one of the injectors is leaking a small amount through the pintle on the end of the injector it will bleed the fuel system presure off and dribble fuel into the cylinder, fouling that cylinder. When you try to start it the fuel that has pooled into the manifold will create smoke when it does start. And since the fuel pressure has bleed off to zero PSI in the fuel supply lines it will need time for the fuel pump to recover the system up to normal operating pressure. Presure testing (bench test) of the injectors is needed to verify this. 2. A bad fuel pump, relief valve, or bleed-back check valve will bleed the fuel system pressure off while it is sitting. To find out if this may be the problem a fuel pressure guage set needs to be installed and then run the engine, verify the operating presure is normal, and then shut the engine down and watch the fuel pressure for excessive drop.
The leaking injector is more apt to create the smoke when it fires up, but both can cause this. I would start with check #2 first. Of course there are many other things that can cause symtoms like this but these 2 are the most likely causes.
Getting this possibilities inspected/tested will help.
Thanks.
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