I've just tried 2 tv cables. One was a stock replacement for an 84 K5 and that had the same performance. Had to switch it cuz the plastic mounting foot was bending.Would think it is the TV cable then
Now I have a tci universal on it that I just set and it's a little better but still holds rpm before shifting. Starting to think the actual valve has an issue.
This same characteristic happened last year after it was built and ran like this for 10+ months.
I know it's working and the cable is set right but it should be working better for a new build, again.
I'll get a pressure gauge tomorrow and see what it do



