Truck running lean out of nowhere.

[C&C Chevy]

I got in my truck today to go home from work. It starts up fine and then wants to cut out, but revs back up. The idle is very erratic, 700rpm to 1100rpm and back again. The truck stumbles all the way home, going about 25mph.

I get out my code book and it's giving me to codes. 24 and 44. 24 is a VSS malfunction. Not sure if this would effect idle. The code 44 is what has me worried. It's a lean condition. Where would be the best place to start? Fuel pump, FPR, other stuff????

I'm seriously thinking of taking it to a mechanic. If anyone knows a trustworthy mechanic in central Oklahoma, let me know!

also, should I worry about driving it to far? I know running lean is alot worse than running lean. Just don't want to blow up my 1 year old crate engine!