Stuck Lifter?

[69chvelle]

Ok guys, I've been searching and reading and just want to get a final concensus.

I recently acquired a 2001 5.3 ECSB with 81,xxx miles for next to nothing because it had a motor knock. It was suggested that the old man probably didn't change the oil like he should've. When I got the battery charged and started, it sounded like a broken rocker or bent pushrod. So I pulled the valve covers and started it without them and watched everything while it was running. Everything looked good. I have a friend whose dad is a mechanic and he stopped by and watched everything and then suggested that it was probably a lifter. After reading all the searches on "lifters," that appears to be what my problem is.

Possible solutions? I've read that the Rislone Engine Treatment will possibly fix this. Others suggested a Lucas Treatment. I even heard that a cup of diesel in the oil for about 15 mins will fix it. I want to try all of the easy fixes before I pull the heads. I have no plans for it to be an all out performance truck, just looking to be a replacement for the 256,xxx mile 4.3/5-speed DD.

So, does it sound like a stuck lifter and are there any other "quick fixes" you can think of? Sorry for the long post.

EDIT: It is also throwing a DTC for misfires on # 2 and #7. Is this consistent with bad/stuck lifters?