Step 1 in diagnosis is ask if anything was recently done to the vehicle. You said you did the gaskets, therefore it's about a 99% chance it's something that was done when you did the work. Most sensors will not break when removed and reinstalled etc.
Sounds a lot like a big vacuum leak to me (aka unmetered air)
How well did you clean your gasket surfaces?
Did you reconnect the EGR tube under the TB at the LIM?
Did you reconnect the two mafs on the back of the motor?
A test you can do is get some carb/brake clean and get it running. Have a buddy spray all around and if the engine changes.. look in the area that was sprayed at the moment.
Hope you get it fixed up asap
