Can't seem to figure out why my 4l80E is shifting rough after it warms up. It is on a 99 suburban w/7.4 liter k2500. I have given the engine a tune up. Flushed the Tranny fluid and filter change.
Thinking about new solenoids but haven't changed them yet?
Someone said MAF cleaning may help.
Once it cools down it will run smooth but freeway speeds after a while will shift out of overdrive and the RPMs will rise above 3K.

Stuck and need some advice.
Thanks,
Brian