If you are like my wife and I we drive a ton of in town miles in the winter. Now is the time to add a can of Sea Foam to the gas tank. More preventive than repair. It will clean the junk out of you engine from winter. I add a can to the tank at about a 1/4-1/2 a tank and then drive it till it gets at about an 1/8 and fill it up, easy and will do wonders.