Whats wrong with my truck?????

Bought a 99' Ford 250 V10 about a month ago. Its got a superchip in it and its set to 87 octane. I plan on taking it out eventually but for now i have plugged it in and ran a diagnostic test on it. It gives me a reading that says that System Too Lean (bank 1) and System Too Lean (bank 2). I have a basic understanding of what an engine running to lean means but dont understand what i need to do to fix it. Also, this truck burns about a quart of oil about every week. I figure these two things have to do with eachother. The check engine light came on a few days ago and the truck is starting to run funny. It doesnt go through the gears at a smooth pace. What are your thoughts of what the heck could be wrong.
Thanks for Your Comments!

What code came up when check engine light came on??
Bank 1 and 2 mean that the side of the engine with the #1 cyl is bank one and bank 2 is the other side if the engine. So both sides are lean.

The oil that you are losing is not good. Are you burning smoke>?

The only thing i have to read code is the superchip monitor you plug in. and that told me it was running to lean. Im not burning smoke. and im using a valvoline next gen oil.

At a quart a week, if you are not blowing smoke, you are leaking oil, so it is probably a different problem than your lean condition. I couldn't say about the lean condition, but as long as you are going through so much oil, you ought to use cheap oil.

At a quart a week, if you are not blowing smoke, you are leaking oil, so it is probably a different problem than your lean condition. I couldn't say about the lean condition, but as long as you are going through so much oil, you ought to use cheap oil.

Where should i start as far as repairs go?

Where should i start as far as repairs go?

Look for a vacuum leak, does it run rough??? Get the codes read and post. How is gas mileage?

Look for a vacuum leak, does it run rough???

Seems to shift funny sometimes.when im in drive with my foot on the break at a stop, it sometimes reves up and down without me touching the gas pedal

Seems to shift funny sometimes.when im in drive with my foot on the break at a stop, it sometimes reves up and down without me touching the gas pedal


You might want to check the vacuum brake booster for vacuum leak. or hose from intake to brake booster.

I would also say vac leak. the truck will give it more gas if it is sucking in air from a vac leak to keep the gas/air mixture correct.

You might want to check the vacuum brake booster for vacuum leak. or hose from intake to brake booster.

ok i will definately check that! im starting to think it might be a bad spark plug or wire because it doesnt run really rough but there is a little bit of a shake. what is your opinion on that?

if that was the case it should have a code for whatever cylinder is missing.

I would check rubber hoses for cracks or any hose that came off of something. check around valve covers and intake manifold. You can put a little transmission fluid or oil arount the valve covers and intake manifold and see if it sucks it in anywhere.

Found this link by googling: Ford V10 Code P0171 and P0174:

http://answers.yahoo.com/question/index?qid=20100406125723AAzuCT8