[ccguy]

i installed a 20 ohm resistor and used a 25 ohm rheostat to make the voltage divider so i could adjust the volts going to the ecu from the hac sensor plug.
the idle changes as i change the volts from 2.8 to 3.8.
seems that when i turn it towards 2.8v the stumble is worse and when i turn it up towards 3.8 it is less noticiable but still there.
SO i am thinking it is something to do with the fuel injection for sure.
the tps readings at the ecu plugs (with it unplugged) are out of spec when the hac is plugged in and when the hac is unplugged it is perfect as it is at the tps.
so ......... and it runs better without the hac plugged in.
i have swapped out the tps and reset it in the past with a new one form az. it acts the same if i use either of the 2 tps sensors i have.