ok so about 3 months ago i completely rebuilt my lb7, injectors, piston rings bearings, ect ect. so i loaded up my trailer today with some logs to haul back home and once i started it up and pulled out to the st and stopped the truck started to idle up in down. so i pulled over and put it in park and it stopped..... i then said f*** it and kept going. it ran mint up until i got to my house where it did it again but very faint. it will only do it in drive or reverse. any thoughts??