Start with the basics, are the plugs wet? If yes, move on, if not go to the distributor and see if it has pressure...etc...
Do the plugs have spark? If not check rotor, cap, coil...etc...

Go in a logical order before 'guessing' items. Guessing can end up costing you a ton of money.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k