1998 GMC Sierra "old spark plugs cause rough" Questions

spark plugs and wires still runs rough as p0300 what is reason? i bought a suburban a wreck and it been sit for 3 years. and it runs fine and no ticking or smoke at all only one thing it runs rough as

...related. Rough idle and rough at low speeds could be caused by spark plug and wires due for replacement. Tranny pans known to leak and is an easy condition to remedy with filter and gasket ...

...old plugs cause undue stress on wires and coils, so make sure the spark plugs are the correct AC DELCO Platinum spark plugs, and just replace the spark plug wires one at a time. Take a spray bottle ...

...spark plugs and rotor also PVC valve and fuel filter but vehicle is still running rough The ignition coil could be getting old and not putting out enough power. The Plug wires could be bad. They will ...

...old spark plug values even if you replace with new ones. Reset the computer by disconnecting the battery for 10-15 minutes. The reset may cause the computer to take time gathering new spark plug ...

...old spark plugs which were practically worn out, I changed my MAF sensor which seemed to be the problem but even with the new one it does the same thing,i don't know whether it maybe the new plugs I ...

...over 5 yrs old is best advice YOU COULD BE USING LOT OF OIL AND FUEL ADDITIVES CAUSING ASH DEPOSIT ON SPARK PLUGS.I HEARD CHANGE GASOLINE BRAND.WORN VALVE GUIDE SEALS WILL CAUSE SPARK PLUG ASHING

...spark plug wires, when the plug wires are old they crack from weathering so moisture can act as a conductor between each of the wires and cause it to run poorly. check the basics, fuel filter, plugs ...

...to suspect are poor gas (like water in your gas), loose fitting spark plug wires, old spark plugs. If spark plugs and spark plug wires are good, you might suspect a fuel filter or even a fuel

...old and acting up do cause problems like what you are saying but i would like to say that spark plugs (being an electrical device) need a perfect ground to work at their best. Oil is an insulator. I ...