Guys, I am desperate. I have an 06 Equinox, 3.4, AWD. Suddenly it lost power big time. Pulling out it is very sluggish. I hit hills, and it shifts down multiple times, to the point I am running 4000 rpms to make it up the hill. I noticed yesterday when driving at 55, if i gave just a little gas, it kicked down once and started surging. New plugs, new wires. No codes. Am in the process of compression check, front 3 cylinders are at about 125. I have to get an extension to get the back cylinders. Any ideas. It is my main transportation, and I am afraid to drive it.

 

I would put a scanner on it and check for pending codes. I use the Blue Driver scanner and app with my cell phone. It gives me live data while I'm driving. I have someone else drive and reproduce a problem and see what the scanner shows.