Well I am down here in florida it is a very nice truck. 2006 crew cab lariat with a 6' bed loaded up 4wd 87,000 miles on it. He basically told me $10k minus the repairs. It sounds to me that it is eating the motor. It has very little power and a shake to it. I don't hear the rod knock but something is very wrong. I didn't get it to stall but my gut is saying at least a new shortblock. He had it at the dealer and it says sluge in motor engine declined. They wanted $5200 for a new motor. He says he changed the oil every 3-5k miles so I am not sure. Any advice what to check? I don't have much for tools down here or anything but I do have some.