valve cover gaskets
I would say one per spark plug.
Count the spark plug wires
bad spark plugs or bad wire connection to the spark plug
The manufacturer's recommended spark plug gap is .040".
that he must remove to get to spark plug rear of the cylinders
Bad spark plug or plug wires. Can also be a burnt valve on those cylinders.
Yes, from the coil to the companion cylinders.
The spark plug wiring is fairly simple; first note that cylinders are labelled 1 - 4 from left to right while sitting on the seat facing forward. There is a coil for cylinders 2 & 3 and a coil for cylinders 1 & 4. The spark plug wires normally have a tag labelled 1- 4 on them but if not see below. * coil for # 2 & 3 cylinders have the two spark plug wires that are normally closest in length - the wires do not have an order as long as the come from the 2/3 coil and can reach the 2 & 3 cylinder. * coil for # 1 & 4 cylinders will have either two wires that are longer than the wires on the 2/3 coil or one really long spark plug wire and one short spark plug wire. The spark plug wires also do not have an order as long as they reach the spark plugs.
check the plug & plug wires make sure you have spark, what cylinders arent firing, easiest way to tell is start it up, and feel exhaust manifold to see what cylinders are firing or not should be hot... if no spark then replace wire, may be bad coil or dist
If on 2 cylinders, replace the coil, if on no cylinders, ignition control module, also could be crank sensor.
Count how many spark plug wires there are.....
A 2004 Hyundai Santa Fe 2.4 has two spark plug wires, for cylinders #1 and #3. Cylinders #2 and #4 use what's known as "spark plug connectors" or "coil to plug boots".