Hesitation possible flooding at highway speed

[jmblocker]

My Yukon feels like it starts to do a little misfire or flood issue at around 50 mph or higher. It's only for a few seconds and it back to running normal again? You can feel it best with cruise on. No codes! Thanks

 

[davidzog]

Can I ask how long its been since new plugs and wires?? Had a similar issue....misfire was so intermittent that it did not set any code...hope that helps

 

[Big Mama]

What year? Model, engine trans 2wd or 4 how long has this been going on? Any recent service? First impression is vacuum but need more details

 

[jmblocker]

Can I ask how long its been since new plugs and wires?? Had a similar issue....misfire was so intermittent that it did not set any code...hope that helps

Thanks for the reply, I just put new plugs and wires thinking that might be the case. But no didn't help??

 

[Doubeleive]

are you sure it's not just the afm kicking on/off, (i.e. 4cyl mode) I tuned mine out bugs the crap out of me but some people don't really notice it much

 

[jmblocker]

What year? Model, engine trans 2wd or 4 how long has this been going on? Any recent service? First impression is vacuum but need more details

2010 Yukon slt 5.3 6 speed auto 2wd. Just put new plugs and wires. Didn't help. Been doing it for 3 weeks.
Thanks!

 

[jmblocker]

are you sure it's not just the afm kicking on/off, (i.e. 4cyl mode) I tuned mine out bugs the crap out of me but some people don't really notice it much

Does the 2010 Yukon have that feature?

 

[iamdub]

I'm with Doubie on this one. Press the DIC button (top or second one) to scroll through the displayed info until you see the "V4 Mode" or "V8 Mode" screen. While driving around those speeds where you feel the hesitation, watch and see if it coincides with it being in V4 mode.

 

[Doubeleive]

Does the 2010 Yukon have that feature?

not sure you should be able to check your dic as mentioned above

 

[jmblocker]

not sure you should be able to check your dic as mentioned above

Ok, Thanks