All, I included the log and cfg I used on our 2006 Trailblazer, 5.3 L, auto, stock with 54000 miles. The car is running well, I get 20-21 mpg on mainly highway trips.
I didn't know whether its a trans problem or an engine problem si I am posting it here. The car has been experiencing a shift, or slight shudder, or like a pause mainly when in cruise. It tends to happen at lower range rpm's. The trans tune in this log is stock, I had some shifting enhancements and it does the same thing. At first I thought it was a trans issue, but in looking at logs like this one for example the pattern at 33:09 to 33:20 or so it makes me wonder if its not an engine stumble causing the trans issue.
Something else when I do the math of engine rpm vs trans out put rpm on the highway it seems like there is a % rpm variance between the two. I don't know ho much would be normal with converter locked. It also seems like the symptom happens when there is a slight change in load like a road grade changing varienceslightly or similar. I did try raising shift speeds up by 5 mph, or cruising at at higher rpm and it still does the same thing.
Any help or pointers would be appreciated.
thanks
Carlos
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