2016 Silverado 5.3 rough idle when warm

[Tmelton]

My 2016 Silverado 5.3 , 38k miles, has a rough idle once it warms up. When you first start it the Rpms are around 700 and idles smooth, even when in drive. Once it warms up and you stop at a red light the rpms drop to about 400 rpms. I’ve cleaned throttle body, changed plugs and wires, I’ve tried all the suggested fuel treatments, I’ve even drove 40 miles each time to fuel up with Chevron (because Chevy says I should use Chevron fuel). Any suggestions? 

[paumat]

9 hours ago, Tmelton said:

My 2016 Silverado 5.3 , 38k miles, has a rough idle once it warms up. When you first start it the Rpms are around 700 and idles smooth, even when in drive. Once it warms up and you stop at a red light the rpms drop to about 400 rpms. I’ve cleaned throttle body, changed plugs and wires, I’ve tried all the suggested fuel treatments, I’ve even drove 40 miles each time to fuel up with Chevron (because Chevy says I should use Chevron fuel). Any suggestions? 

There are updated motor mounts to reduce felt vibration. Mine were replaced under power train warranty. They helped considerably. 
 

[MY164X4]

Check coil pkg.


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