Truck Repair: rough running, vacuum hoses, vacuum leak

Question
Hi van I have a 2000 ford explore and it run rough in the mornings. I used a code reader and it read po171 &po174 whitch says its running to lean can you help me.

Answer
Too lean means not enough fuel, or too much air.
Have you changed the fuel filter?

Checking the fuel pressure would also be a good idea.

Something else that causes lean, is a vacuum leak.
There are the obvious possibilities of vacuum hoses, but there is also the EGR valve sticking open, or tha brake booster leaking, or the PCV valve stuck open.

Van