Miss firing at random

7-2-6-5-4-8
i hope this helps as this should be the correct firing order for your car

sounds like you have the wrong firing order for the spark plugs.

The firing order is 1-3-4-2 going clockwise around the cap.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

FIRING ORDERS

Before carrying out extensive tests to isolate poor running problems, check connections of spark plug wires. This is especially important if plugs, wires, distributor, etc., have been disturbed recently for service. Obviously, this is not applicable to the wireless 4.7L engine.

NOTE To avoid problems, remove and tag the spark plug wires one at a time to ease reinstallation.
For vehicles with an extensive service history, keep in mind that the distributor could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason, it is very important that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired.

Fig. 2.5L Engine Firing Order: 1-3-4-2 Distributor Rotation: Clockwise

Fig. 3.9L Engine Firing Order: 1-6-5-4-3-2 Distributor Rotation: Clockwise

Fig. 5.2L and 5.9L Engines Firing Order: 1-8-4-3-6-5-7-2 Distributor rotation: Clockwise

Fig. 4.7L Engine Firing Order: 1-8-4-3-6-5-7-2 Distributorless Ignition

Fig. 8.0L Engine Firing Order: 1-10-9-4-3-6-5-8-7-2- Distributorless Ignition
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CHANGE SPARK PLUGS.YOU NEED SPARK PLUG 3/8 SOCKET.YOU NEED SHORT AND LONG 3/8 EXTENSIONS.YOU NEED SPARK PLUG BOOT PULLER AND A SPARK PLUG GAUGE SET THE SPARK PLUG GAP.NOW CHANGE 1 SPARK PLUG AT A TIME SO YOU MIX THEM UP GET FIRING ORDER MIX UP CAR BACK FIRE WONT CRANK.ALSO CHANGE PLUG WIRES ALSO.

Have you changed the spark plugs. I recently changed mine in an expedition and tried using the E3 plugs which were about $56. I don't see any mpg difference but I can tell a difference in take off or during acceleration. My opinion is go back with a basic OEM or Bosch platinum. Also make sure that the COP is seated good on the plug. I would also recommend using an Di-electric grease to coat the inside of the COP. Hope this helps.

firewall

4 - 8

3 - 7

2 - 6

1 - 5

front

The spark plug firing order is 1 - 3 - 7 - 2 - 6 - 5 - 4 - 8 Make sure the coil is good.

What size engine? Check the gap on the plugs as well. "pregapped" is not always right

CHECK THE SPARK PLUG +WIRE +COIL.TO THAT CYLINDER.IF ALL IS GOOD.DO A COMPRESSION TEST ON THAT CYLINDER. IT COULD BE MECHANICAL PROBLEM IN THAT CYLINDER.LEAKING VALVE OR INTAKE LEAK.

You can have car put on scope and it wll show any irregularities in the ignition system. It can also be dowithout any equipment. First, loosing ALL 8 spark plug wires, Now place the spark plug wires loosly back on, just secure enough to secure. You might need 2 people. Being the miss is more consistant in gear, APPLY THE EMERGENCY BRAKE , put trans into drive and raise rpm's till miss is obvious. Remove ONE plug wire at a time, TILL THERE IS NO DIFFERENCE IN MISS. Thats the cylinder missing. Start with the spark plug, inspect, work back to wires and cap. An EXTREME result will be NO COMPRESSION.

were is distributor cap on 00 kia sportage