So I checked the codes on my car and I got code 21, high voltage at tps. What should I check out? It did come on though about the time I stepped on the gas.

 

well today I backed the car out of the garage, put it in park and went to close the garage door and the car quit, then when I was at my friends house I started it up after sitting for maybe 4 hours, I was backing down the driveway(going down hill), it started to faulter so I put it in nuetral and gave it a little gas and it ran fine,