I have a 2005 2500hd with transmission problems. It stopped pulling and showed P1810 code, so I replaced the tranmission fluid pressure switch and put new fluid in. It ran fine for maybe 30 miles then wouldn't pull again. If it sits for a day I can crank it and it will spin the tires, but after maybe a minute it stops pulling and has no power. If it sits again it will do the same thing. Does it in all gears and reverse. Help please.