My 2000 Yukon engine hesitate

If you are getting a check engine or dash light check for codes
Really I think it could be fuel, air or back pressure. It is a good thing to have codes sometimes.
Below a few thing which my help

http://www.autotap.com/problem4_engine_hesitates.asp
https://www.youtube.com/watch?v=bDCaAZedVYY

https://www.yourmechanic.com/estimates/gmc/yukon-xl-1500/engine-hesitates-during-acceleration-inspection
https://www.youtube.com/watch?v=cXHfJTbcSgY


https://www.youtube.com/watch?v=-SRgNXKoOC8
https://www.gm-trucks.com/forums/topic/200207-yukon-xl-denail-2009-severe-hesitation-and-poor-gas-milage-real-head/

It seems you have an extremely scary and dangerous situation going on, you should never smell gas ....anytime. .

Because this is so far out of the ball park, you just have to get it looked at by a pro.

ENGINE HESITATES WHILE ACCELERATION

LOSS OF ACCELERATION

It can be fuel pressure issue or it's the problem with accelerator pedal or its clogged filters causing there.

There are many other possibilities. I suggest you to go through the list of help links mentioned below, these will help you to confirm where the actual fault lies: -------

Jerks and Hesitates During Acceleration?

http://technoanswers.blogspot.in/2012/07/2004-dodge-town-country-jerks-and.html

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Loss of acceleration?

http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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Headlights flickering and car hesitates to start?

http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html

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How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html

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2004 Toyota Avensis: Acceleration And Deceleration makes noise on Front End?

http://whatisbyme.blogspot.in/2012/05/2004-toyota-avensis-acceleration-and.html

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Wheel hop under hard acceleration?

http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html

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2009 Chevy impala accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Acceleration lag problem?

http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

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These details will help.

Thanks.

sounds like the fuel gauge is off
how many miles can you go on the 1/2 tank of gas

My guess would be something electrical that is not working due to the temp. Like a relay.
A relay could loose magnetic power for a few tries then start working.
Or the engine temp sensor could be out of calib and telling the computer the temp is 90 degrees when it is only 50.
You could use a scanner to read the sensors and look for something not right.
Without knowing what is missing in the equation its going to be tough to diagnose it. You really need to know if you are loosing voltage to the coil or the injectors or if the fuel mixture is too lean, etc.

Go under the seat and take a look.

This can be fuel pump related or just fuel filter related, spark plugs and injectors.
When engine is cold vaporization of gasoline is minimum. When fuel vapor is less than required and the fuel mixture is not ideal, ignition happens harder than it does under ideal running conditions of engine. When fuel pups is sweak, or filter is limiting, or fuel injectors are not injecting gasoline with improper pattern inside engine, or just becasue of corroded spark plugs, cold engine faces difficulties during first ignition.

PS: sometimes car starts and stalls.it fails to start once more. this can be a sign of broken crank position sensor. FYI.

i had this happen over and over then expedition started cutting off when making u-turns and from there it got worse hesitating all the time... finally it ended up being trash in my fuel pump!!!
i had to have my fuel pump replaced.. my suggestion is to get it to a mechanic asap!!!!!

might have to turn it over for quite a while for the fuel pump to prime itself .

My 2004 Yukon does same thing. Usually when I'm coming up to a stop. GMC dealer said "No fix."