I have a 1997 Toyota Avalon and have just recently replaced the struts with some Monroe Gas-Matic Strut from Advanced auto parts. After about the first 100 miles on the new struts they started making some noise... as if they were loose.. So I tore off the wheels and checked and rechecked everything. The noise still persists and is getting worse. I only replaced the struts and boots. The sound the car is making... A knocking/cracking noise over bumps. Any suggestions at all would be great! Thanks.