1995 Toyota Corolla concern

Hi there again I ask you about a over heating suituation an your answer was correct thanks. And thanks for placing how to test a relay I felt happy to see that never knew how to test one. I havea question my 1995 toyota corolla when I start it on morning an put it in reverse gear it will not pick up the gear or drive for about 3 to 5 sec then it will engage an I can reverse but it work fine after that all druing the day only tihing I never did was change the transmission fuel filter wonder if that cause the little stall on mornings. Later I the year I will place a donation cause I love this site thanks 2carpros