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The shift kit is definitely not wired correctly. The shift kit senses engine load by measuring manifold vacuum. The torque converter doesn't lock up during heavy engine load, which is the only time the shift kit should be functioning. Downshifts should be under zero engine load, and thus the shift kit should be doing nothing. You should not feel a pronounced downshift during deceleration, ever. Because you are getting the flashing power light, this indicates the problem is being detected by the TCU and is related to the electrical wiring. It sounds like solenoid A has been disconnected, probably by unplugging the dropping resistor during the wiring process, and you have full shift pressure all the time. The shift kit should have included a resistor soldered to the relay. This resistor prevents the TCU from detecting the shift kit and sounding the alarm, so to speak. Even if the shift kit was mis-plumbed, or malfunctioning, the TCU shouldn't complain. The wires just aren't hooked up right. ...unless there's some other unrelated problem with the transmission that's upsetting the TCU.
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