Naturally casein-free foods are of vegetable origin. Fruits and vegetables are casein-free foods, and nuts can also be considered in the diet if there are no restrictions. However, some processed foods containing fruits, vegetables, or nuts may not be casein-free foods. Casein is an excellent binding agent and may be used in spreads, dressings, and other processed products.
Engine misfire is the first sign of poor spark. Basically, the spark plugs are firing poorly or incorrectly, so combustion is not ideal or controlled. The sputtering or chugging of the engine is a sure sign of misfire, but a noticeable loss of power or a check engine light due to raised emissions are also symptoms.
Following the engine's thick, black wires will lead you to the spark plugs. Remove the spark plugs with a spark plug puller. Checking the color of a spark plug helps diagnose the problem with the fuel-to-air ratio. If a spark plug tip is white, then the engine runs lean. If the spark plug is black, the engine runs too rich. Clean the spark plugs, and reinstall them in the engine.