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. In addition, pour in a bottle of HEET or gas stabilizer (just in case there is too much moisture in the gas tank).
Also check condition of battery terminals and cables.
Battery test. Engine off, lights on for one minute. Voltage across terminals should 12 to 12.5. If you have an Autozone or Advance nearby, they will usually do a free battery test and tell you how much cold cranking amps your battery has and determine is it is "strong enough".