I just tried to BBQ some pork back ribs with my gas BBQ. I also used some apple wood chips for some smoke flavour. I soaked the ribs in apple juice for about 4 hours and then lit one of the burners to bring the BBQ to about 250 degrees F. I put the ribs over the unlit burners and cooked at this low temp for about 3 hours ( squirting apple juice on the ribs every 30 minutes). After 3 hours, I basted the ribs with margarine and let it cook/smoke for about another 30 minutes. I then basted honey on it and left for another 30 minutes - at the end I put BBQ sauce on it and left it for about 40 minutes. The ribs tasted good but were tough (not falling off the bone as the recipe said they should have. Any advice on where I went wring?