Engine Performance problem
1995 Other Nissan Models 6 cyl Front Wheel Drive Automatic 200, 00 miles
My van was running fine and the gas milage was good until I changed the air filter. No other work was done. Now it will not idle without stalling and I have to keep my foot on the gas during idle. Once it starts and you drive it, it begins to idles roughly and will cut off at stops. The gas milage is terrible. What?