hey so ive had this problem for a little while just wondering if anyone else has it or know what the problem is.... almost every time im slowing down for a stop sign or wtv and dont come to a complete stop, if i hammer it, the rpms jump and the car starts going but slowly like its slipping, then the whole car starts shaking when it does get into first for no more than 2 seconds and everything is fine after that.

is it just slipping? shift kit has been done about a year n a half ago.