my truck won't start,has fire and gas but it won't start..it turns over but nothing..i have replaced the fuel pump,spark plugs,dist cap and rotor,wires..i have noticed that the spark plugs looked fouled up after trying to crank it a few times..also looks like the spark plugs are wet from gas????...puzzled! it never ran hot so i know it's not overheating..it started with a fuel problem,thinking maybe injectors??