i'm trying to help a buddy of mine with a basic 4.8 tune and honestly its pretty confusing, so any help would be highly appreciated. i just dont want his truck to blow up or anything. rcsb 4.8, headers, intake...
here's his stock tune,modified, and wot log.

 

How does it drive, the trims look to be pretty good to me, they are only off by a few % which is OK.

 

it dont drive bad.. i thought you said it was real lean? the highest i saw was 5 %

 

Lean at WOT, trims only work with not in PE...

 

oh ok so if trims dont work at wot then what are you looking at? 02s'?
it seems like that top one is starting to drop off. can you tell which sensor that is?

 

Yep i was looking at the O2 sensor voltages, they should be 890+ Not dropping off like that one side did.

 

What up with the timing i see 14* to 23*? I thought you would want timing to be higher like close to the 30*? I would replace the 02 sensor something not right with it.

 

Not sure if it's the sensor or what. But something isn't right with Bank 1 (left side). At WOT it went limp for a second and then caught back up.
Could be faulty sensor or something in your PE mode perhaps.

Edit: screenshot

 

yea i noticed that. i'm going to get him to buy new o2's and a fuel filter, theres 166k on the truck so who knows how old they are? and if you notice the stock spark table has more then the modified? is there a % i can hit the stock table with instead of whats in there?