My 1999 volvo 850 wagon non turbo runs real rough. I had previously changed a defective ect.It ran ok for about 3 months. Then it sat for 2 weeks. I checked the codes with my handheld scanner and no codes were returned. I then proceeded and replaced the following as a standard maintenance procedure. The spark plugs , cap , rotor , fuel filter , MAF . The car still ran real rough and hardly running. After test driving it i had noticed smoke coming from under the car. The cat was cherry read so i replaced that too. And it still runs rough with no codes returned. I checked all cylinders for TDC in relation to the distr. tower position. All was ok there too. Can anyone help me. Thanks The Diman
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