I have 1999 slk 230 which has sat for a few years and when I went to start it you could tell immediately there was something wrong. It ran fine in idle but the minute I pressed the gas it spit and sputtered then it stalled. I have changed the fuel, fuel filter, MAF, air filter, took out and cleaned all the fuel injectors, and checked the throttle body. For a minute it seemed to run good after the fuel injectors were reinstalled but then went back to the same old thing. I am out of ideas on what it could be.