My recently purchased C280 stalls, and/or spits and coughs when I try to accelerate. It's also very weak in acceleration. After doing this for a week or so, it stopped doing it and I was lulled into a false sence of security until it started happening again a couple of days ago only this time the 'check engin' light is glowing as well. I've done nothing accept change the fuel filter. That seemed to help some but the problem is still there. Thanks, Bob H