I bought a 2001 Ram from my step dad. It had been sitting for about a year with no battery in it. It ran fine when he parked it. Now, it misses, sputters, and sometimes pops when the motor is loaded. I changed spark plugs and wires but nothing changed. Also, it won't run at all hardly if it isn't completely warmed up. I do have a check engine light but that's for a neutral starting switch. That wouldn't affect it would it? Also, the truck only has 75k miles.