Rough Start --- help!

[audiophile]

Whenever I start my truck and its been sitting for about 6 hours or more, it starts rough. The longer it has been sitting, the rougher it is. I do have an aftermarket chip, could the amount of fuel the computer is sending be different at startup? It stays very rough until I tap the gas a little to rev the engine and it returns to normal idle. It stays at normal idle and rough anymore. I can turn my truck off and start it up again and it starts up with proper idle. Only after its been sitting for a while. It was doing this before and is still doing it after my headgasket was replaced. Could it be my old injectors? I'm not sure if they have EVER been replaced! All suggestions are welcome and appreciated.
-Burns

 

[BadForm]

You're not the only one. I belive my injectors are all stock, and occasionally the problem is so bad that it floods on initial turnover. I've suspected my injectors are leaky, but I haven't investigated it yet. I'm busy fixing other small problems in the meantime...

 

[audiophile]

I do believe it is my injectors. I put a bottle of fuel injector cleaner into my tank beffore i filled up yesterday and this mornnig it fired right up. Now this is just a temporary solution because I still want new injectors. Would new injectors possibly raise my gas mileage?