Well
honestly I would get rhodium plugs since that's what it came with also these will give the longest wear and reliability. you can get others but they will get worn down faster. I recommend a performance distributor cap and performance rotor since they are usually built a bit better and are about the same price. now spark-plug wires well if your looking for old faithful duralast makes some for 50 bucks that have a limited lifetime warranty to me this is unheard of since they are designed to wear out like the plugs. however if your into performance wires autozone has a really nice performance set bigger gage lower resistance for a bit over 100 but no guarantee on it.
ac delco
There are many stores that sell the NGK spark plugs for cheap. However, the store that sells the cheapest NGK spark plugs would be the AdvanceAutoParts site which gives a 20% discount code.
13 ft lbs
you push in the wire after turning of the plug yhen get some pluers and get it out
The general consensus with most performance oriented Bronco owners is that original Ford Autolite or Motorcraft spark plugs work just as well or better than most "performance" spark plugs.
8 most likely cause it probably has a v-8 in it
Well start by changing your regular spark plugs with performance plugs and also change ur plug wires too, try performance plug wires. Get a after market cool air intake.
Not in a negative aspect. only positive
Just as long as you get the proper length plugs for the engine you won't damage anything.
Change the plugs and plug wires at around 100,000 miles or earlier if you detect a miss or loss in performance of mileage.
spark plugs that are not hot enough will yield poor performance. recommend ngk iridium plugs(laser platinum works the best) they will burn hot enough to give you the performance you need.
If it ran good before, it's got to be minor.