My 2000 Kia one day just lost the normal amount of power to around 50 percent. I had recently had a code indicating that number 2 cylinder had misfired. I replaced the coils, wires, plugs and wiring harness. All was good and then two weeks later I had this sudden loss of power. It is important to note that I have "0" codes. None notta. After reading some forums and possible remedies, I have replaced the fuel filter and MAS air flow sensor in anticipation that they were bad and not throwing the codes. I swallowed my pride and took it to a very reputable mechanic. Being the honest mechanic that they are, they ran all kinds of tests and couldn't isolate the problem and after a week only charged me 50 bucks for running all of the tests. I am thinking that the timing belt may have jumped time, but I would think that I would have a cam sensor code. Any information would be greatly appreciated.