RPM moves speed goes till 80km. on 2005 Chevrolet Trailblazer

My car RPM moves but car can't pick up some time goes till 60
what is the problem

Asked by for the 2005 Chevrolet Trailblazer
2 answers 1 comment
have some one scan trans sensors and sloenoids like aamco with there free diag
today I will go for scan let see! The mechanic replace Gear Oil and GearOil Filter
Sounds like trans.trouble.