ballast resistor on the firewall, it's a porceloin block with wires going to it, replace it.
look on the underside of the hood there will be a sticker that says the gap
I had a similar issue, auto parts store sold me the wrong spark plugs. look into your plugs and wires.
It depends a little on what type of engine you have. Look under the hood for your spark plug wires. The single component that all of them connect to (not the spark plugs), is the distributor cap. Underneath it is the distributor.
do you mean distributor on engine or dodge vehicle distributer? if you mean distributer on engine, diesel does not have a distributer.diesel does not have spark plugs so no need for distributor. if you mean doge vehilce distributor, look in your phonebook
Deeper inside the engine than you think: if you look at the top of the HEMI and notice those 4 black boxes on top of the engine, the spark plugs are under them. (Take off the two bolts that attach the coil pack, move them to the side and flash a flashlight down the hole and you should see the spark plug.)
look online for aftermarket companies.
Remove the spark plug wire from the spark plug. Wearing heavy gloves or usinf insulated piers, hold the wire about 1/4 inch from the engine block. Crank the engine in short bursts and look for a spark to jump between the end of the wire to the engine block.
look in the owners manual for that info.
open the glove box and look inside to the left.
The ( 2 ) engine , cylinder heads , are on each side of your V6 engine where the spark plugs are - just look for where the spark plug wires connect to the spark plugs
The Dodge 3.9L has a timing chain.
A small engine...it will be in the farthest left gauge.