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2001 Sierra hesitates when cold

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My 2001 Sierra with the 5.3L hesitates when cold. It will start it up without issue, I let it run for a minute, then when I give it gas it will hesitate then finally get up and go. Then as I am driving and giving it gas everything is fine. When I let off the gas the engine will almost die, low RPM, lights dim and then return to normal idle. Also when I am at a stop it will occasionally drop in RPM then return to normal idle. After it warms up everything is fine. Any ideas? Or should I just take it in. Thanks!

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