Quote Originally Posted by bootlife View Post
Reason I thot the tune could be an issue is at 20 mph when it shifts to second it barks the tires lol
the pcm at least in my tunes, isn't programmed to shift that hard.
a faulty epc or pcs, maf, tps, can cause this.
Generally speaking, if the transmission is shifting thru all gears the pcm and mechanics of the transmission are working together.
There are so many variables that can cause similar issues.