I bought 1995 4wd Blazer with a bad automatic transmission and have finally got it on the road. My check engine light will usually come on everytime I drive it. The codes are usually never the same and after being reset I will usually have a different code the next time. I did determine that I get the code P0340 Cam Position Sensor almost always on start up. Once it is cleared it stays off until the next start up. Does anyone have any idea's what might cause this? The wiring appears to be good at first glance, I am leaning to possibly some weak grounds.

 

The grounds all look good and I have discovered I only get the trouble code when the engine is at operating temperature, it will not come on during cold starts, any idea's?