Okay looking for some advise.... here is the situation, truck is new to me, dont know when it last ran but... my engine will not start, here is what I know... Did a compression test on all 6 cylinders, all tested out above 125 psi, most around 140. Which is plenty of compresion to pull the fuel through (I think). We pulled the top of the carb off and it was just full of varnish, gave it the jiffy clean up with paper towels and carb spray. Drain the fuel, which was junk and poured 5 gallons of fresh stuff in. It still doesn't want to start? It has spark, and it huffs and back fires out of the carb like it is out of time, if you pour gas down the carb., but just doesn't want to go. The PO tryed to time it with a timing light... he says they got it back in time... I dont know how to do this, so I can not explain what he did, but I think he knew what he was doing.. He only used a light to time it... is there more that needs to be done... Thanks for your replys in advance.. A.P.