Ignition is usually the easiest of the three to check because on most engines, all you have to do is pull off a plug wire and check for spark when the engine is cranked. On coil-over-plug DIS systems, there are no plug wires so you have to remove a coil and use a plug wire or adapter to check for a spark.
Stress can affect every part of your body. muscle aches, head aches, how your hair grows, the texture of your skin, it can affect your menstrual cycle.
How Stress Affects the Adrenal Glands. According to the American Institute of Stress (AIS), stress is one of top causes of poor health in people living in the United States. Chronic stress can lead to high blood pressure, digestive issues, obesity, memory loss, high blood sugar, a weakened immune system, and chronic fatigue in some cases (source).