There are many reasons for Car Jerks. I'm trying to cover some common possibilities through this article.
#1 Fuel Impurities
One very common problem across all the Car Jerks is due to impurities or low grade petrol filled in the vehicle. There can also be a case of water droplets availability inside the fuel tank and this might also result into car jerks. Any impurities like this blocks the carburetor track and hence it results into the car jerks.
#2 Spark Plug
One non-working or damaged spark plug can also result into the Car Jerks. In such situation, first try to remove and clean each of the spark plugs and place them back. It this didn't work, and if you are able to locate the faulty plug just replace it. Spark plugs are comparatively cheaper than other parts such as Coils and Injectors.
#3 Coil
After checking the spark plug you can just check the functionality of Coil. This is generally placed just above the spark plug fitting (this may defer from car to car). To test the functioning of the Coil, simple method to test with the new Coil. If it works, you need to replace the Coil with new one. There is no alternative of repairing the faulty one. Coils are little expensive.
#4 Injectors
Injectors looks similar to Spark Plugs but forms a major part of the ignition system in the car. Very rarely you reach to this stage where you come to the conclusion of injectors are not working. Almost in all the modern cars, there are electronic injectors and these operates using the laser rays. Typically injectors gets affected in case of short circuits or similar type of electronic breakdown in car. It has been observed that injectors are getting affected also because of impurities. Faulty injectors may also affect the spark plugs working. Injectors can not be repaired but needs to be replaced. Injectors are very expensive compared to other options given.
