CEL after accelerating
 

So tonight I worked on my car. First time doing anything mechanical to a vehicle.

I added the 5/16 copper iso thermal spacer. Everything seemed to go fine during the install but ran out of time and didnt get to install the copper spacer for the throttle body.
The the car wouldnt start after it was installed. I did a ECU reset and it started up.
Driving down the road its kind of running weird. The CEL light only comes on after i accelerate and then let off the pedal.

Anyone had this problem or know what the problem could be?