So I got the dreaded flashing D4 which mean transmission problem. My car is a 2000 4cyc automatic. Pulled the CEL and got P0780. If I clear the code the car will drive fine for couple miles and D4 will start flashing again, once it starts flashing I notice the car will stay in 2nd gear and only shift to 3rd. Won't go into 1st or 4th. Any tips on which solenoid it might be?