Have a 98 honda accord automatic 4 speed aproximatly 280000 km
When I go to back up it idles and in a couple seconds it takes for the transmission engages and slams in to gear
back up put it in drive same thing it idling and in a few seconds engaes like a bang and it move forward no problem.
now when I drive it seams to slide in to gear like it is slipping and finally engages smoothly now thou
I did have a trouble code but the mechanic cleared them and cant get that back
and I can not get that code back up
but it shift solonoid a or might be b cant remeber which one. and I can only get one at honda the other one is no longer availble
Just wondering if this is the problem or is the transmission going

You can try the solenoids but from my experience it's rare that it fixes the issue. The only way is to replace the trans with different one. I don't suggest a junkyard trans because there are so many issues with them. We have a customer with a '98 Accord that needed a trans and he supplied us with one from the junkyard. Guess what? It's worse than the one we took out and the junk yards won't do a thing about it besides sell him another one.