2004 Honda Accord V6 transmission problems?

I have a 2004 Honda Accord V6. About a month ago while driving down the road it felt at though I had slipped my car out of gear into neutral, my rpms were revving up but I had no power. I took it to the mechanic and he said tranny rebuild. And so we did. I got the car back about 2 weeks ago and on my way home from the shop the shifting of the tranny was not smooth. It jerked me every time I changed gears and when taking off from a stop it sometimes acted as through it was never going to change. I took it back to the shop and he plugged it up to the machine, even though the check engine light was not on and he told me that it threw a bad solenoid code. I left the car with him for it to be replaced. I picked it up a few days later and he told me that it still wasn't shifting as smoothly as he would like, but that he thought that the valves were sticking? And that he had put a pint of something into the transmission and for me to drive it and he thought the performance would improve as it was driven. Now it's been driven over 250 miles and I'm still having problems. A couple of days ago I was at a complete stop pulling out of a parking lot. When i tried to accelerate, I had to get up to 2000 rpms before the car would even begin to roll, then when the jerked hard down into 2nd, the check engine light, the TCS light, a triangle with a! Inside of it came on, and the green dot beside drive was flashing. I turned the car off and all lights went off but check engine.code P0746.

First off, if he did not use Genuine Honda ATF DW1 automatic transmission fluid that may be part of the problem. When you take it back tell him you want nothing but genuine Honda fluid put in your transmission and make sure he removes all of the fluid he installed if it was not Honda fluid. That will require more than just draining the pan as most of the fluid is in the torque converter. I will bet that he will tell you that he used a fluid that is compatible as it costs much less that Honda fluid. Do not let him tell you any different. Insist he use Genuine Honda ATF DW1 even if you have to drive to your local Honda dealer and buy it yourself. Using any other fluid can and will cause shifting problems. I have seen what using a fluid that claims to be compatible does. Rough shifts and hesitations. The code PO746 can be caused by several things. Here is what can cause this code to be set.
1. Low fluid level
2. Dirty transmission fluid
3. Faulty Line pressure Solenoid Valve
4. Line pressure solenoid valve harness is disconnected, loose, or shorted
When the a transmission solenoid is stuck off, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. The gear required by the Engine Control Module (ECM) does not match the actual gear when driving which causes some weird things to happen.

That mechanic screwed things up. All of that is transmission related. He needs to fix it at no additional cost to you or find someone to do it for him. Throwing "fix it" liquids into a Honda transmission was not a smart thing to do.