Maybe this is normal but frequently my tarnsmission bumps into third from second after starting from a dead stop under normal acceleration. First to second and third to forth are normal.
Can anyone help????

 

This is not good....The pcm is going into a default shift mode,due to some code setting (most likely),and commanding high line pressure.

You need to get it checked..the code is probably a p1870....its a very tricky diagnosis.