It won’t go out of first gear after sitting at a stoplight or idling. Turn it off, back on, it works slightly, but then doesn’t work after that. At first it was intermittent but now it’s constant. Transmission bad altogether? Shifter cable, vacuum lines, computer issues? Fluid is good. It’s a 4 speed automatic. Wondering if maybe the trans is just overheating but I’m lost. And pissed off. Please give advice!