My car just randomly starting hesitating/bucking. It only does it from 2500-3800rpm. Sometimes when it bucks, its real bad, other times I can barely tell.....I have 3 old TPS's. (I replaced the original one several months ago with a used unit) I still get hesitations with all 3 installed. 2 of them show really weird readings. When i set it to 1k ohm, with key in, pushing the screw or pressing the throttle causes the reading to go down instead of up! Reading will increase slightly to just over 1k, but then as the throttle opens more, it drops down to about .5k......My other TPS seems to be ok as far as readings go, but the car still bucks.....I do have a new TPS on the way, so hopefully that will fix my problem

 

i think it's safe to say that those are bad TPS's.