There is a part called a throttle positin sensor which would do very much as you described it.The sensor cannot detect how much gas you are giving it nor does it know how much gas is being delivered.It is also an input for the control module which tells the rest of the system how to react.The symptoms of sudden acceleration and slowness could also be the transmission(not very likely though),but the rough idle and strange acceleration appear to be more likely the sensor.The transmission would likely have other symptoms such as rough shifting,gears winding out if you know what I mean,shifting back and forth between gears at a certain speed in which you are just at the same speed,meaning not accelerating or slowing down,say just cruising at 35 mph.Also,there are no lights because the check engine light HAS to be the worst thing ever invented for a car.It illuminates for things even when your car is running fine,but you would think for something like your situation,SOMETHING would illuminate.People have spent thousands replacing everything which the computer tells them from the check engine light diagnostic,yet it remains on.I have seen it.If you are in the USA,call any AAA approved shop and they would likely say something similar.Good luck,Greg
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