I've already swapped out the solenoid. No luck. Battery is good. I "think" I checked all the ground connections and safety switches. Problem is when the key is turned on the engine turns once... then slows to a stop... it may go over again.. but it won't go long or fast enough to start... RRRrrr... pause... RRRRrrr... pause... no start. Any thoughts? This problem occurred after the tractor was running and ran out of gas. I checked and the fuel line is clear... Spark pluggs cleaned, air filter good... I think if the engine turned long enough it would start... in fact it did start once... and ran great... but then it would not start again...