What holds coils of what down to what?
mesentery
The mesentery.
They run down the center of the engine under the coils. You can see the coils when you remove the resonator (the thing that says Vortec 4200 on it). One bolt holds the coils in place. Remove coils and change plugs. Actually you will need to remove the two front tire to to get to them and I would advise watching videos on the removal as two have struts blocking direct assess and you will need a flexible shaft extension or an universal joint for those two at least.
They are in the valve covers. On each side of the engine, on the valve covers, there are four black cap looking things with a bolt holding each one down on the side. disconnect the wires from those things, which are the coils, and then remove the small (i believe 10 mm) bolt that holds it down, and then pull up on it. The plugs are under the coils. Hope this helps
A step- down transformer is one whose secondary voltage is less than its primary voltage, it is used to reduce 'step down' the voltage applied to it. The number of coils in the primary circuit is greater that the secondary circuit. For instance, to step down 480 Voltage to 240 voltage, you need a step down transformer whose ratio of primary coils to secondary coils is 2:1.
Low frequency coils
You have to take the bolt out of each of the coils, pull the coils out from under the fuel rail and the are down in the hole. Screwed into the heads.
Either the coils are no good or its misfiring
Gravity
The coils gather dust and make water (condensate) which feeds mold. Change your furnace filter after you spray the coils down with a weak bleach solution. Use a wet-dry vac to pull the wet dust out of the coils. Be gentle with the coils because folding the fins over will reduce the efficiency of the AC. You will usually find the coils in the furnace plenum. Cleaning the coils will improve the efficiency of the system and remove the source of the stink.
The purpose of the coils under a refrigerator are to allow the refrigerant to cool down before being turned back into a liquid. This allows the compressor to function properly.
Gravity.