Tire Tube Problems of Chevrolet Suburban

As I was driving, I hear a noise coming from outside and could feel roughness in the ride and the steering. I pulled over within 30 seconds to find that my tire was 80 % flat. Upon replacing the tire I saw that there was no evidence of puncture or nails to the tire. A few minutes later after I had put my spare tire on, I stopped and inflated the flat tire to see where the damage might be. After inflating to about 10 psi I stopped because I noticed that the sidewall near the outside edge(near tread) had a very soft spot that I could have probably pushed my finger through. It was almost as soft and thin as a inner tube. Then I also noticed several lumps about 1 to1 1/2 inches in diameter almost all the way around the tire casing near the outer edge. This was all on the white letter side of the tire. I briefly look at the back side but did not notice anything. All the time I never heard an air leak, although an hour later it was flat again. As I stated earlier I only put appx. 10 psi. When I saw the knots appear I stoped in fear of the casing rupturing. It definitley appears to be an internal problem such as belt or ply separation. Before I contact Chevrolet or firestone I wanted to bring this to your attention since I think this might be related to the current problem the the other recalled tires and did not want the evidence(my tire) possibly lost or destroyed with you having a chance to see it if you wish. Non the less I now need a spare, so I have to do something soon. I will keep the defect though. I really do not want to put another firestone on my truck. Until today I thought the problem was only on the 235 tire. Me and my family need your help to assure us that my firestones are safe or should I be looking for another tire. Please advise soon as possible. Thanks george( dot number: v672wli070 tire size: 265/70r16 ).

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