I learned to make my own BBQ sauce this past year using a recipe.. Slow cooked pulled pork at my house is the best BBQ I have ever had.
The recipe is this one:
Sweet/Spicy BBQ
With a few mods:
Instead of 1 tbl worcestershire sauce use 1/2 cup.
Add 2 cloves of garlic (minced).
Delete pepper sauce.
Use 1 teaspoon of ground cayanne pepper.
Boil that til it mixes real well, then sit it in a fridge over night. Put it in a slow cooker with some pork shoulder the next day and let it go for about 8 hours. For added flavor, marinate the pork in it while it sits overnight.