Place ribs in a large bowl or resealable plastic bag, set aside.
In 4-cup glass bowl, stir together vinegar, water, oil, molasses, salt, red pepper flakes and cayenne pepper until salt is dissolved. Remove 1/2 cup marinade; set aside.
Add remaining marinade to ribs; seal bag and marinate for 4 - 6 hours in the refrigerator.
Prepare medium-hot grill, or fire if cooking with charcoal.
Remove ribs from marinade; discard marinade.
Grill ribs over indirect heat for 50 to 60 minutes or until pork is tender and the internal temperature reaches 160ยบ F.
Baste ribs twice with reserved sauce mixture during last 15 minutes of grilling.