Soaked mine in PB and still doesnt loosen

 

damn i live in wisconsin and my **** was rusted solid and i still got it off without pb

 

Hey when you find the problem out post it up! I need help also! Ive changed my fuel filter (which was a pain/siezed) new fuel pump 255 LPH, new k/n filter, plugs, checked all the tires air pressure. 87 Oct,

1999 gmc 1500 5.3 ECSB 3.42 2wd w/ 200k 13.5mpg city/highway

no service engine soon light but 2 codes come up... bank 1 sensor 2 lean and bank 2 sensor 2 lean so Im thinkiing this is the issue... bad o2s but why wouldnt it set the light off? plus I havent done plug wires yet.