I'm starting to get nervous about starting Foles this weekend.  Here's my thoughts:
Last week Foles got off to a slow start, obviously the weather played a factor.  But the Lions had a 14 pt second half lead, and forced the Eagles in the second half of that game into comeback mode.  Eagles ran all over the Lions in the second half and won going away. But Foles was very involved in the initial comeback.
Looking forward to the Minnesota game, Eagles run game is really cranking right now, and if they are in a position to salt away an easy win, they could ask Foles to hand it off pretty much all of the second half.  The Vikings are a mess right now.  Probably no AP and maybe not even Gerhart.  And Carlson might also be a no-go.  Matt Cassell isn't scaring anyone, and the Philly defense is highly underrated now, after a very poor first half of the season.  They could shut them down early.
I see Foles getting his 150/2 by the end of the first half taking advantage of the first half, due to the awful Vikings secondary.  And then game managing in the second half, finishing with a ho-hum 225/2 type game, letting Shady and Brown do the work.  If Minnesota can't put pressure on the Eagles, like the Lions were able to do last week, I'm afraid that Foles upside will be limited.  Still think he's a low QB1, but I am starting to doubt his upside.