Took my truck to a mechanic to replace the oil pressure sensor and when i went to pick it up it had a miss on cylinder 1. The plug wire and coil has been replaced. What else could it be and how in the world are the 2 even remotely connected? 2008 chevy silverado 1500 with 5.3

 

they are not related.
Is it a dead miss that is there at all times?


swap the plug with another cylinder and see if the misfire stays with the plug. if it doesn't do a compression check. I believe cyl 1 is an afm cylinder...if you have no compression, the afm lifter may have collapsed. did you run it out of oil?

 

The miss is there all the time, didnt run out of oil in fact i had too much oil when i sent it in.