1997 Nissan Sentra

I have recently(5 days back) done break service(Front & Back) for may car. Break pads & rotors are replaced in front. Break shoes in rear. Spark plugs changed, air filter, fuel filter, gas filter complete 90k service. I hav etwo problem it make noise while I stop on taffic signal & then start moving slowely(just releasing break slowly). The secnod problem happened yesterday, I stopped at signal, when I allowed to go(green light), car did not move, even after pressing gas padal & Car have taken almost 2 minutes(another red & green signal) to move. Please let me know what is wrong, I am really worried after spending 600$ & even my wife & a 2 month old baby was there with me in car.