A few days ago, my check engine light came on. It flashes at times and is solid at times. Flashing mostly when accelerating and then solid at idle. Original code came up as p0335 so I have ordered a crank position sensor. Truck has been misfiring at times daily and really bogged down temporarily at highway speed. Today I checked the codes again again and I got a 0315 (crank position sensor not learned), 0300 (multiple cylinder misfire), and 0303 (cylinder #3 Misfire). The crank sensor is going in Monday. Are the later codes a by product of the original problem or can I be looking at a serious issue here? Any thoughts on where I go from here? Hoping that I have no serious cylinder/valve damage. I also did plugs and wires when I first noticed the misfires. Thanks in advance for any help.

 

It would seem to me that if the crank sensor was bad, then that would be the issue causing it to misfire and cause the other codes. Have you gotten the sensor installed? Reply back if the problem goes away or if you still have one after you've got it in. Good luck.