I am just about out of ideas. I have a 93 dodge le d250 with the 318 5.2 liter manual. This truck had sat for nearly 3 years but before that it worked just fine. I siphoned out the old gas, replaced the fuel filter, checked the fuel pump and put in about 10 gallons of gas. On the engine i replaced the ignition coil, spark plugs, distributor cap and rotor as well as the wireset, and checked the starter.When i go to start it crank and will pop a bit on the air filter but no combustion. Taking a plug out and holding it on the chasis i was getting a good spark and fuel was spraying from the cylinder. However, when i put it back together no combustion. I have an old Duralast battery in it. Its a size 34 with 660 cca and 800 peak. Also im pretty sure the alternator is shot. Is there anything im missing?