One day I put gas in it and drove for 5 hrs on and off then I went to go drive somewhere and started the car but it Idled rough then stalled. I can keep the car running by holding the gas yet stalls when I go to shift. I was able to get it in limp mode to not stall by disconnecting the throtle body plug and drive to the machainc. He still hasn't found out. No codes being thrown showing what it is. He said fuel pump is working also he replace fuel valve but didn't fix the problem. Can you guys HELP PLEASE.