Probably pull it apart and inspect the shaft and bearings to make sure all is good. If shaft is good a rebuild kit just to refresh it and should be good to go
Is it tuned for the 1150s? If not you're putting way too much fuel in. These ecu's are known for capacitors leaking causing problems. 120 psi seems pretty low. Should be around 180 psi warm. A few have had around 140 cold. Does it even try to sputter?
Well, the p0700 means your tcm is bad, or has a short in it. I'd start by doing a tranny flush. Low fluid can cause issues and the tcm will pick up on it and set a code. Another common issue is actually the crank position sensor
Well as you know, the 1g has no lock or unlock switch. So the way it locks or unlocks is by the driver's door lock position. My guess is the rod for the lock came off in the locked position. Can you pull the lock on the door panel in the unlock position?
Some shifters give you a 1,2,3,D,N and P. All it means is 1 will only stay in 1st gear and 3 will still go through 1,2 and stop at 3rd. Another way to describe it is turning off the overdrive on an auto. You have another gear after but it's not going to go into that gear because it's not turned...