ok so today i plugged all the sensors and **** back up and started the car and reved it a bit and it was fine (brand spanking new motor btw) and when i reved it past 5krpm the CEL started flashing so i shut it down

could this be caused cause i plugged the o2 sensors wrong?

bump

 

I doubt it. The O2 Sensors don't have the same plug-ins... and then wire lengths are different... so it would be pretty hard to put the Front O2 sensor in the Rear O2 Spot.

My question... why are you revving a Brand New motor to 5k???

 

You were driving when you reved it to 5 k I hope,and think about breaking it in a bit.

Flashing cel indicates major misfires,check the code and see which cyl.
Most likely all cyl if you are rev to 5k standing still.(No load)

 

I'm betting on this part...