[Atx328]

So I live in the hilly country near Austin and in the morning when I leave my house, I end up going up a large hill that is about a 1 to 1.5 miles within the first 5 miles of driving. I have swapped out Coils twice and put in new spark plugs about 15k miles ago and then about 1K miles again. The missing/hesitation most often occurs when the car is shifting down about 2/3 the way up the hill.

It isn't currently throwing any codes nor a SES light. Do I need to start looking at fuel injectors or would those be a constant problem not related to load?

I also swapped out the GM Auto trans fluid and that actually seems to have made it worse but that might just be my imagination.

The coils are currently Delphi Units and the spark plugs are a mix of NGK and Denso - although I will probably switch over fully to the Denso's this weekend to remove a variable.

Thoughts on what I should try next? It isn't stopping the car from functioning as a DD but it just bugs the crap out of me! Help!