I noticed that the guide shook. The continuing problem I verified the balance of tire and it was right. At 1:00am i got a front tire flat. When the tire was inspected, it was noticed that tire looks fine, new outside but it was completed consumed in the interior. Something unexpected for a car well treated, with only 11 k miles. All four tires are in the same condition. New outside, completed damage inside. This car is SSM, with 21 bands. I have three sports, I never saw something like this, I loss all confidence in the suspension system. The cost of replacement is over 2,000 just in tires, and I don't know if we can fix the alignment. My other Z28 from the 1970 is far more reliable.