Yes, it can cause a miss which will set the light.
yes, and also, using the wrong gas cap could also cause the light to come on. It may even cause your engine to stall
Directly, no, but it's possible that the same root cause (something wrong with the electrical system) could make both warning lights come on.
You may think there is nothing wrong but there is. If the check engine light is on there will be codes stored in the ECM. Have the codes read. The codes will help you determine what the cause is.
If the light has come on the system has a problem and set a code(s). Most auto parts stores can read the code(s) and tell you what went wrong.
Your bad muffler might be part of the reason your check engine light comes on. Usually, your bad muffler causes something else to go wrong and that causes your check engine light to come on. Problems cascade.
No, but a defective fuel cap can set the "check engine" light to come on.
Yes, it is one of many things that can cause the check engine light to come on.
it wants to
The Check Engine Light comes on when an error code is sent to the Car's Central Computer. Take it to a servicer who can download the code and tell you what's wrong. It could be any one of a thousand things wrong.
Smaller tires should not cause the check engine light to come on. Smaller tires will cause the speedometer to be off.
No, it would cause the "low oil" light to come on.
No, not unless your connect the plug wires wrong or one of the new spark plugs was bad.