04 Yukon is having trouble accelerating sometimes..

Have you checked for any trouble codes? Is your check engine light on?

Do you have any warning lights on the dashboard? This sounds like a fuel issue. This could be a faulty sensor in the fuepl system. Get it plugged into an OBD2 diagnostic system or an OBD2 scanner to see if it shows any Trouble Codes. These will give clues as to what and where the issue is. If you are going to a mechanic to do this ask for a price at 4 or 5 different places as the prices charged can be VERY different. Comment below with the Trouble codes and I'll try to help you more.

Low fuel pressure maybe??? Is your check engine light on and if so have you pulled sny trouble codes....That amay help you narrow down the problem

often times the engine needs to warm up to normal operating temperature. this varies from makes and models. if you cant wait that long, having it idle for approximately 5 - 10 minutes should at least lessen the acceleration problem, but the longer you wait the better it will be on the engine.

It's an obvious transmission problem, If you throttle down and it Does NOT move that's the problem

go see a mechanic my friend..

It sounds like your battery is going bad. When you accelerate the alternator spins faster generating more electricity. Take it to a auto parts store and they can do a free test to confirm what needs to be replaced.

Probably all related , all these systems are interrelated .One won't work without the other. Could have a problem with the TAC system - electronic throttle control . Your best bet , take it an have the computers checked for DTC'S - diagnostic trouble codes . Do you know anything about automotive electronic's ,serial data communication networks ?

If this happens when you are idle, and then you get hot air as you drive, most likely you have low coolant and it only cycles as you drive. Get approved dextrom gmc coolat and cap off your coolant it is most likely low.