i got the AC system charged and working,but it seemed to bog the motor down a little as it will,i was going to have the timing checked and tune up done after i got back into town.before i left town my son told me that he had adjusted the carb to stop the boging down when the AC was running.he drove it around for about 2 days then one day it wouldnt start(it didnt break down running it just wouldnt start)so he say`s.i asked when i got back how he adjusted it he pointed to the needle valve.that`s why i think it might seiged becuse of the bad gasoil lube the truck was getting...