The other day it was pretty cold up here in North Dakota. I went out and started my 95 Bronco w/ a 351. I let it warm up and then left the parking lot, and after just a little ways the CEL came on, so i headed back to the parking lot. When i got there the light went off, so i left again and it came on again. I never got over 30 mph. Well i drove it the next day, light never cam on. Yesterday i drove it about 200 miles, no problems. I pulled the codes and got code 63. Which is a voltage problem with the TPS (i believe). My question is, why didn't the cel stay on. Also, am i looking at needing a new TPS? Thanks. If this doesn't make sense just tell me.