A few issues..whats going on with my car?

[5280DSM]

Ok so my car runs alot better than it did but is still far from running perfect. It has a high idle around 1500 to 2000rpm but the idle doesnt surge, sputters while idling slightly and when im at WOT the car hesitates up until it hits boost then it clears up. I pulled my plugs and they are starting to get white...so im thinking its leaning out. I have no AFR in the car so there is no sure fire way to tell. Only fuel system upgrade is a wally 255. Wouldnt the car bog and hesitate before boost if it was getting too much fuel though? Oh and the whole wiring harness looks like a monkey wired everything up. But my biggest concern is that my temp gauge on the cluster isnt working...it was disconnected from the harness completly and didnt even have the correct plug. So i patched everything up as clean as possible and hooked it up to my sensor, looked at my temp gauge and it spikes all the way past the red mark. Mind you the car was sitting for about 3 hours and had plenty of time to cool off and i really dont want to be in the dark concerning my cars engine temp. Pulled some codes from the CEL today and this is what came up:
23--Cam pos. sensor
41--Injector (might be a stored code because i fixed the injector wiring as soon as i got the car)
11--O2 sensor
21--coolant temop sensor (maybe because it was disconnected)
Im stumped guys so any and all help is greatly appreciated!!

 

[SlickTalon]

well the funky idle can be from the crank sensor OR the O2 sensor. so get those fixed if you can.

did you do the fuel pump rewire with the 255?

 

[5280DSM]

Not sure on the rewire since i bought the car with it already installed. Any tips or info to know what to look for on a rewire? And the o2 sensor is a strong possiblitly ### someone thought it was a good idea to lay the wiring for it right on top of a nice and toasty exhaust manifold z

 

[obsidian]

I hate buying a car that is premodified because of reasons like this.

Check the throttle body is properly adjusted and the cam position sensor is set correctly.

 

[minimoose]

Dont quote me but I think your suppsoed to run a FPR with the 255.

I run a 255 walbro with a aeromotive fpr and I have the pump rewire kit but dont have it wired in. It was already in the car but I rewired it with the factory lines when I installed the 255.