symptoms of a bad TPS sensor

What are they symptoms of a bad TPS sensor??

My idle is rough.....well rougher than normal. I checked for vacuum leaks and found nothing. I have already replaced the IAC valve.

The idle acts like I am running a huge cam. It has crane 1.7 roller rockers and some larger looking than stock springs.
I am pretty sure that even if there was a cam installed it would not be this bad. What should the voltage be on the TPS and how is the best way to check??

Thanks

I set the timing at 13 degrees after installing the gt40 intake. But the idle has been rough since I purchased the car.
It idles like there is a very large cam in the car. It is not like its miss firing or pinging when I accelerate, if anything it is highly possible the car is OVER camm'd.

I do not know much of the history of this car. I got a smoking deal on it (probably for the above reasons). It is just odd....I expected this idle to smooth out after installing the new intake. I fixed and replaced all the bad vacuum lines and anything that appeared to be frayed.

What is the largest cam you can put into these with stock E7 heads?? It might just be the cam is counter productive.

Thanks