It's everywhere, you know I am on the stock tune so obviously the decay rate is not my problem.
My guess is one of the lines is allowing too much air to flow into the i/m, possibly keeping the engine high the in the rev range? My guess is that the engine uses airflow first in conjunction with the tps to adjust the afr, so possibly with too much air entering after the tb plate is closed, the engine is staying at the shift rpm by just keeping afr at stoich.
You would think though that the tps would kick off the ddr to ease the engine down in the rpm range.
Hmn