P0300 code after replacing parts

[Fless]

I got a 2008 Tahoe LTZ and my traction stabilizer l light was on I changed my steering wheel angle sensor and it went off but now I'm having a code co455 and co242 can anybody help me out with these codes don't know what it means

Please stick to your own thread, you have one going already, right?

 

[MalcDogg]

Classic symptoms of leaking valve stem seals or bad valve guides. But as was asked before, why did those valves get bent?

I have no idea why the push rods was bent I replaced a lifter then was still getting a misfire so something told me to check the rods they was fine when I replaced the lifter and took it for a test drive

 

[MalcDogg]

I got a 2008 Tahoe LTZ and my traction stabilizer l light was on I changed my steering wheel angle sensor and it went off but now I'm having a code co455 and co242 can anybody help me out with these codes don't know what it means

This is what I found the steering sensor is off alignment go get a wheel alignment