Having problems with the car running lean, what can cause this?

When I got the car dyno'd about a week ago, the fuel curve was way off. I started at 42 psi of fuel and 15* of timing and ran about 16/1. We bumped the Fuel to 52 psi and dropped the timing to 12* and the fuel curve was still 16/1!!!!

So I'm either having fuel issues or a vacuum leak that I can't find... I've sprayed carb cleaner over every gasket surface and there was no change in idle RPM's.

I'm running a new H/C/I combo with a FTI cam. I'm pulling 10 lbs of vacuum at idle (Normal for aftermarket cam???). I also don't have the smog pump on the car anymore and I'm pulling codes 311 and 314, which have to do with a valve on the lines having to do with the thermacator tubing.

311 - AIR System inoperative during KOER (Bank number 1 with dual heated oxygen sensors
314 - AIR System inoperative during KOER (Bank number 2 with dual heated oxygen sensors

I've installed a new 255 lph Walbro Fuel pump, a set of 24# injectors (used) and an adjustable fuel pressure regulator (used).

Anywhere you can guide me to check I'd appreciate it. I'm pretty close to yanking the intake and re-doing that install even though I can't find a vacuum leak.

Thanks!

I'm getting them tested as soon as I hear back from a few places, thanks!! I'll keep ya posted!

Jeremy,

I've looked further into this problem and I'm leaning towards the fact that I had a good sized exhaust leak which was causing more air to be sucked into the exhaust stream... I dunno though. I also found a crack in my lower intake so there's another $300 that I have to spend now.

I've also sent out the injectors to be professionally cleaned and flow tested just to be double sure. We'll see when its all back together.

Oh yeah, one last thing, is your lower intake ported Jeremy?

Thanks for the replies!