1999 Ford E350 Super Duty Triton V10 chassis on my 2000 Winnie Class C RV

I bought this rig in 2018 and it has served me well camping and fly fishing from the Mexican border to Canada on my own.

117,000 miles of which I added the last 25,000. Purchased from the original owner.

Towing my 2003 Honda CRV...my fishing truck.

The reason I joined the forum is to try to tap into the wisdom of this group. I'm an old guy at this point so I my DIY capacity is limited. But I can follow directions and do the simple stuff...more or less. I am willing to do some diagnostic testing myself.

In late 2019 In Montana it dropped the p171 and p174 lean codes. They are still there many miles and many $$ later. Starts well and runs great. Two shops have taken a whack at it with no success.

So what I am really looking for is a referral to someone who has deep experience with this engine and this problem...not finding that in Yuma, AZ so far. If the referral is really good, pretty much anywhere in the western states works for me.

Picture is on the Klamath River, 2018.

Thanks.