Transmission is slipping?

Perhaps I need to take it to someone who has a better code reader. Thanks for your help.

My explorer will sometimes mostly after being drove for a good period of time slip into neutral when taking off from start. There are no codes or problems with the fluid. Do I need a transmission rebuild? Like I said it does not do it all the time. Is it worth rebuilding, my engine has 210000 miles on it or should I get another vehicle?

Could a torque converter cause this problem?

So I should do a pressure test for sure?

We have a couple of issues with our 1999 Ford Explorer sport. First, if the engine has run for a while, usually after doing errands I have a possible transmission slippage problem right as you take off. We have no other indication of transmission problems other that this instance. If you go very slow for a little bit and keep lightly stepping on the gas you can get it to shift normally. The second problem is when you get going at about 35 mph there is an extremely irritating loud noise and echo in the vehicle. This has been a great vehicle and we are financially strapped right now and cannot afford a new vehicle but I don't know how much longer I will be able to drive it! Thank you for any information.

We had the trans serviced about a year and a half ago, but probably only 10K miles or so. The truck used to be my husbands primary business vehicle but has become my run around town vehicle so it gets driven very little.

Hey, my explorer will rev up between 1st and 2nd gears and not accelerate. After it revs up it will accelerate just fine. When I stop, something will unstick underneath the floorboard. I could really use help on this, this has been going on for months and I cannot find the issue. There are no codes at all. The transmission fluid is perfect. It will not lag all the time. It can drive for two to three days and not do it. It does like to do it more often with the AC running. Earlier I was terrified, because when taking off from a stoplight, it would not go(the whole suv shook while it wouldnt go.) And then all of a sudden it jumped. Im so glad a car was not in front of me. Any ideas? I was told I could have a bad MAF but how can it be a sensor if my check engine light is off?
Also could it actually be a bad Valve Body Gasket? Thats what I think it is?

Went there and there were no transmission codes.

I do for a fact have a bad fuel pressure regulator for sure which causes it to kinda rough start sometimes. There are no vacuum leaks and all hoses good.

For my model its replacing the fuel pump, but how would that cause the transmission to slip?