My check engine light came on earlier this week (haven't been able to have codes read) and i have noticed that the engine seems to be running hard. The transmission has been slipping from time to time when accelerating on the highway. When i'm stopped at a stop light the engine revs in 1st gear and if i put it in park it revs all the way into 2nd gear, i'm not sure if it's a sensor or something more major with the transmission. Anyone with any advice, i'd greatly appreciate it. Also, I recently replaced the CAM sensor and the Crankshaft position sensor, not sure if those may have anything to do with the problem i'm experiencing.