Moin Moin, I bought a nice Calibra with only 120000 km. The car runs really great until it always runs slightly bumpy in the stand and sometimes starts badly. The start is really good you only have to have a little 4 – 5 seconds organs then he comes. Sometimes he starts immediately. Only in the stand there he runs a little rough. Do you have an idea what it can be? I wanted to change the spark plugs and I don’t know any more. With friendly greeting Dennis.