2008 Suburban misfire cylinder 1

No, the evap code has been there for over a year. so i dont think its the source of this issues.

86000 miles.

ticking. Ok backstory.
>Burb running well
>developed tick
>took to mech#3 (who i used to trust)
>He fixed tick, said it was lifter on even bank
>Also changed oil with wrong oil, 5w15 instead of 5w30
>Runs really rough when he brings it back
>he puts correct oil, runs better, but still shitty.
>i hook up to obd and find misfire #1

As of now there is no ticking.
So, im not sure if what he did broke something. Seems like really odd timing for something new to develop, but what can i do.

I had the car about a year before problems started.

I tested spark with the screwdriver method and got zapped.
Need to get my multimeter back from the neighbor and will test the coil input wires.

Carb cleaner can was empty so need to get more and then i'll test for air leaks.

I've been reading about issues with the AFM on the 5.3's. Something about hydraulic lifters seizing due to low oil pressure? Anyone know about that.
But a seized lifter would make a loud tap right?