92 LS Auto slipping

[Hairy '85 Si]

I have a 92 LS with an auto trans and it had been sitting for a while. I got it running and it drove great for about 10 miles. Then it started acting as if it was in neutral in any gear forward or reverse. any auto people got a clue?

 

[Justin66]

If its been sitting get a fluid CHANGE, not flush. Is it still doing it after after its warmed up fully?

 

[Hairy '85 Si]

It does pull sometimes when cold but only for a hundred feet or so, then it starts slipping.

 

[Justin66]

Try some new fluid and go from there.