2004 Chevrolet blazer #3 spark plug

ok when last you have service the engine? i think its your fuel filter change it and see what happens ok,another thing according to the weather if your area is dents or forggie you may have moisture in the spark plug wires and dis/cap check that if you cant change the wires get some wd/40 or some electrical spray and spray the wires and see what happens then i hope i was of some help to you

The code means the cylinder is not producing power, which is not always an ignition problem.
It could also be a faulty injector, or something mechanical.

Your Coil Pack Is Separate And Plugs Into The Middle Of Distributor Cap.Follow The Middle Wire To Coil Should Be On Passenger Side
Easy Quick Change Out. Cost Is Around $40

Do you have a code scanner? What code does it give? If you don't have a scanner and the car is drivable take it to an autozone and have them hook it up to the scanner to get the code or you can buy a cheap scanner for $50 if the blazer was not running rough before you may have not pushed a plug wire on completely and now the engine is misfiring on that cylinder. how many miles on blazer? the platinum plugs from should be good for 100K miles.

A basic tune-up would be spark plugs. Make sure you use a/c delco plugs! A major tune-up would include plugs, wire, cap, and rotor. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

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

Check the spark, it should be blue, if it is yellow than you need to check your ignition system, coil,spark plugs, spark plug wires, dist cap, rotor ect.
Black coming out the exhaust is unburned fuel, when you have the spark plugs out do a compression test.

ya go to a mech, if you strips the srews on the cap (and rotor), youll be sry. I have a blazer for 10 years and find that they must be changed yearly. Buy a GOOD set of plug wires and GOOD spark plugs, they are a real tought time to replace.

CHANGING SPARK PLUGS IN TRAIL BLAZER. YOU NEED TO REMOVE AIR INTAKE RESONATOR AND IGNITION COILS.YOU NEED LONG 3/8 EXTENSION - SPARK PLUG SOCKET - 3/8 RATCHET WRENCH. NEED SPARK PLUG GAUGE AND A TORQUE WRENCH.YOU CAN GET BY WITH OUT ONE LONG AS YOU DONT OVER TIGHTEN PLUGS AND STRIP OUT ALUMINUM THREADS.

ON TOP of Engine there 6 Coil Units the SPARK PLUGS are under them, and they Require a 10mm Socket or Wrench to remove them, once the BOLT is out PULL OFF the COIL and there is a Rubber BOOT that ALSO Requires Replacment Along With The Spark Plugs.
the Spark Plugs are DOWN INSIDE the HOLE.

If your calling the steering shaft the handle bar.you need to put tthe socket on the plug first then use a wrench that will fit the hex on the out side of the socket to fist loosen it tne it will be easier to turnwith a rachet or just by your fingers.If it's the plug i'm thinking of it is a pain to change.