Either the spark plug(s) are not tightened properly (and therefore not allowing proper compression) OR one or two plug wires are on incorrectly.... at least 1 is correctly fitted to allow combustion.
Changing your spark plugs could theoretically make your car faster but not enough to make a noticeable difference. Changing your spark plugs when they are worn will increase your fuel mileage slightly.
When changing spark plugs it is important to know their location under the hood of the car. For a Toyota Rav4 the spark plugs are under the engine cover that has the car symbol on it.
When changing the spark plugs of a car, it is important to remember to gap the spark plugs. The gap for this cars spark plugs are 0.051 inches.
This will dpend on the type of vehicle you have,as engines do vary. Generally speaking a socket wrench should work for changing your spark plugs.
change spark plugs
If not gapped right your car might start shaking, or even stall or worse no star.
Changing spark plugs on a Subaru is no different from changing spark plugs on any other car. You may have to remove parts of the air induction system to make access easier. Be sure to check the gap on the new ones and use anti-seize on the threads.
When changing the spark plugs of a car it is important to leave the right gap size. The Spark plug gap for this car is .042 inches.
It is important to keep the spark plug gap in mind when changing the spark plugs of a car. The gap for this car is .051 to .055 inches.
When changing out the spark plugs of a car, maintaining the gap is important to help the car run correctly. For a 1993 Dodge Intrepid the spark plug gap is 0.04 millimeters.
You probably do not have one or more of the wires fully seated on the plug ends. Make sure they "click" into place.
How long spark plugs last depends on the brand of spark plug and the condition of the car. In a well maintained car, some spark plugs will last from 3 to 7 years.