@abrax894,
I experienced something similar as you described, where the RPM suddenly dips way low when coming to a stop. By trial and error, I found that RPM dip disappears if you adjust the throttle mod to where you have just a little bit of deadspot left before the throttle engages. If you somehow go "over" this limit, I experienced RPM dip when coming to a stop.
It's my personal opinion that the throttle body is no more than an rheostat ( adjustable resistor ) controlled by how much you push down on the accelerator. It's my guess that when coming to a stop, the ECU tries to lower RPM by cutting off gas to a pre-defined limit, but when it senses that throttle is open ( i.e. too much throttle mod ), less gas is sent, and the result is that the car stalls.
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