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My 03 corolla with 110,000 miles was shaking the other day when I was driving it so I took it to the auto part store and hooked the diagnostic machine to it. It said misfire in cylinder 1. My friend changed the spark plugs and it did not take care of the problem. I then took it to his friend you is a lisensed mechanic and owns a shop in which he specializes in honda's and acur's. He changed the coil pack and still the same problem. He was going to do compressionon test on it. Is there any small thing or something that he might not know to check that it can be. If it is something major like a piston ring I will have to bring it somewhere else. iam veranxiousus and worried please help. I can drive it but when it is idle I have to put it in neutral because it trembles.