After removing all of my coil packs to change my valve cover gasket on my 2002 envoy the bolt on # 1 coil pack broke off level with hole in the head. as a temporary fix i used a piece of flat steel between coil 1 & 2 to clamp it down. coil 2 bolt held the clamp down on the side of coil 1. coil is tight but now engine runs rough and smells like rotten eggs when driving it

Hi Brian what you are describing is a little confusing however if you have oil in the spark plug holes the most likely cause would be the rocker cover gasket. Now this is not the head gasket but the cover that goes on top of the cylinder head. There are normally rubber O ring seals that are part of the sealing gasket they sometimes leak oil into the plug holes. Normally this is the only entrance for oil into spark plug holes. There is or should be a rubber seal at the top of each stalk of spark plug connector from the coil pack to stop water or oil entering the plug hole. However if oil is leaking at the breather pipe connected to the rocker cover there is a very slight possibility it may be leaking oil into the cavity of the coil pack and into the plug hole. This I have never seen as due to its design it would normally find its way down the side of the engine before the cavity for the coil pack. Good luck

Edward, may just be a leaking valve cover gasket, have a good tech. have a look and estimate repair.
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The coil pack will be numbered. Find coil #3 and follow the spark plug wire to the spark plug.

The GM products such as the olds bravada has a problem with oil getting into spark plug area where the coil pack is bolted down, the coil pack and plug are emerced in oil and causing the coil pack to misfire..to check this have the codes read to determine what coil pack it is..and remove it by removing the bolt holding it in place..if there is oil it will be right there to the top in many cases. Take a paper towel or something to sponge the oil out and clean the spark plug connector, no need to remove the plug and replace the coilpak with a new one...this is a problem but not real serious..suggest removing the other good coils and clean the plug area and plug Then replace the good ones..or if you wish replace with new...oil is from valve/cam shaft cover gaskets bad or loose..you can try and tighten the securement bolts or have a garage mechanic take a look...good luck

Yes valve cover gasket needs to be replaced, normally for sluggish I would be looking at a MAF mass air flow sensor.

The valve cover gaskets need to be changed. there are rubber grommets that keep oil out of the spark plug holes that dry out and harden with age. Replace gasket and grommets and oil will stay out.

On he very top of your engine, there will be six coil pack, they all look the same, from front to rear of engine, remove 10mm bolt, disconnect elec. harness, pull coil pack out, spark plug will be in there, do one at a time, this is the spark plug gap .044"

The Spark Plugs are located under the Coil Pack in the Cylinder Head. You need to remove the silver cover on the front part of the engine which are held down by Allen Bolts to access the Coil Pack. You will need to remove the two bolts holding the Coil Pack to the Cylinder Head. Pull up on the Coil to remove the Coil and inside the hole will be the Spark Plug. The rear part of the engine next to the firewall has no cover so you will need to just remove the Coil Pack. The Nissan Maxima is very picky about the brand of Spark Plugs you replace them with, You should only use NGK Platinum Plugs or Better in your Maxima, Any other brand will make your car run rough.

You have a 4.2L inline 6 cylinder, on top of engine you'll see six coil pack's running front to back on top of the motor, disconnect harness on each one remove small bolt's pull all six coil pack's out, spark plug's will be in there.Don't worry you don't have to put the coil pack's back in the same hole.

Most likely an oil leak around the ignition coil packs in the valve covers. Remove the center covers on the valve covers and remove the coil packs and see if you have oil in the spark plug wells and on the coil pack boots. If so you will have to replace valve cover gaskets and the orings around the coil pack holes. You can also get the coil pack boots separately if the are oil saturated.