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In a medium sized mixing bowl stir together 12oz cili sauce, 10oz grape jelly (or about 1/2 of the squeeze bottle, it doesn’t have to be exactly half) and 7.5 oz Dr. Pepper (I use some of the Dr. Pepper to swish around inside the chili sauce bottle to make sure it all comes out).
Pour 1/2 of the sauce into the bottom of a crockpot.
Add the entire bag of frozen meatballs on top of the sauce and then pour the remaining sauce on top.
Cook on LOW for 6 hours or HIGH for 3, stirring occasionally.