Well they are usually very powerful. They're good if you don't mind them being gas guzzlers.
Because the engine cylinders are like a V - 4 cylinders on each side
Driver's side front to rear 1-2-3-4 Passenger's side front to rear 5-6-7-8 ------------------------------------------------------ OOPS ! actually , the PASSENGER side , front to rear is 1 - 2 - 3...
Not enough info, please reask question with year, make, model, and engine size.
Auto Zone will check your computer codes for FREE. Then go from there. It maybe a bad coil pack, plugs or wires, exc.