I have a 2007 Chevrolet Equinox. I'm having Traction Control and Stabilitrack, and a check engine light on the IP. I changed the EGR valve about 6 months ago. This only cleared the stabilitrak / traction control & check engine light for a while. It didn't fix the transmission issue. The transmission has still been slipping between 2nd and 3rd gear. Now, 6 months after changing the EGR valve, I'm having the same issues with Stabilitrak / Traction Control and check engine light. Any ideas?