2000 GMC Yukon XL 1500 Questions

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Please help me

Car sounds good runs good just want move even when you put it in drive

It started acting up all of a sudden. It has 205K miles on it. I changed the fuel pump 50K miles ago. was working fine then all of a sudden when I put the car in gear it just hesitated. I was able to drive it home but when I pushed the peddle to the floor it would stall. It hesitates to start but once it does it idles fine but when I press the peddle down it stalls and some times it sounds like its choking or back fires.

Any ideas on how to fix this would be appreciated

Randomly. But sometimes it dosemt

My Yukon's transmission goes into and shifts easy but when it gets warm after 1-2 miles seems to shift in to neutral. Turn it off and let it cool. I have gears again. Is it a some switch or the transmission?

water pump and serpentine belt replaced last week

brand new motor,transmission.idle doesnt even change when tryin to shift.

Purchased used about a month ago. Switch button shows 2WD and won't change. Forums suggest it may be one of several problems. How can I isolate which component is culprit? I do not have code reader or lift. Former owner says he had a problem getting out of 4WD. I've never gotten it into 4WD.

where is the heater control valve located

replaced MAF sensor,new fuel filter vehicle still hard to start plus runs ragged now diagnosed no codes

there is not a light on in the dash

i changed the therostat and checked the fluid levels

Just replaced the battery in a 2000 Yukon XL, now it stalls. Anything I can do, or does it need a certified mechanic?

how to fix this problem