How can I repair or troobleshoot?

Demise, Buy the whole Ford spark plug rethread kit, no guessing involved. You can google search for the kit, to get a good price.
Check the attached links,instruction and guides, Good luck
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Make sure you have a good ground when you check your plugs. Without it, you will never get power to flow through it. If they are grounded, then trace it backwards to either a coil pack(s) or to the plug wires. (depending on the year and type) Then from there, follow it back to the disributor cap, rotor, and even the distributor itself. Finding out where you're losing spark will go a long way towards repairing it.

heres a list, ignition components damp or damaged, worn or faulty spark plugs, broken...loose....or disconnectedwiring in starting circuit, loose distributor changing ignition timing, ignition coil loose...faulty or disconnected wires. its good your cam & crank sensors were changed, but no spark indicates coil packs not able to get spark to plugs, but spark plugs may be fouled, replace them. replace distributor cap & rotor. check fuses, there's one for the ignition switch, check it. try all this see how it does,, also, if you haven't replaced both the AIR & FUEL FILTERS , DO SO !!!!!!!! just for thought, my daughter has a sentra gxe,2002, it started losing power on the highway, we had to have nissan replace it, $900 , you may have to deal with this, sell the car ! when you get it running, if you want. although , after we did repairs, tune-up, timing belt (not chain), etc., it runs like a top, she loves it ! good car if you ask me, just keep filters new, brakes good, it will go forever !

As for the wire just use a butt connector and a crimp tool to repair it. As far as a weak spark check that all your spark plug wires are in good condition and secure to the distributor cap and plugs. Quite a few things can cause a weak spark. Sparks plugs could be old and fouling, cap and rotor could be worn out, coil could be going out, or the ignition control module.

Hello and welcome to FixYa!
Overheating is caused by multiple issues. A faulty water pump, corroded radiator, worn out coolant hoses, a crack cylinder head, auxillary fans are not working or it can just be lacking coolant.
You may want to start on the easiest part first by checking the coolant before going to a major repair.
Hope this helps and thank you for using FixYa! Have a good one!

The spark coil is bad if you have no spark

Small engine repair. Part is expensive.

Have you checked spark for sure?
1) Spray WD-40 directly into carburetor
If machine has spark, it will fire
2) Is exhaust port clogged with carbon and dirt?
3) Get new spark plug
Pull out old spark plug
Put spark wire on plug
Hold spark plug wire with fingers
Put spark plug threads against metal opening where spark plug came out.
Metal to metal
Pull cord or push starter
Look for spark between metal

No spark, then spark coil is bad.

The easiest way to repair this is first go to an auto parts store and purchase a spark plug thread repair kit. In this kit will be a tap, to rethread the hole. A spark plug insert to put on your spark plug. What you have to do is tap out the hole, then blow out the hole with air to get all the shavings out of the port. You can use canned air for this if you don't have a compressor. Then install the insert on the spark plug and insert plug and your ready to go. Just remember you must now use the insert on the plug ( you can reuse the insert) every time you replace the plug. Good luck.

1st= spark plug 2= wire 3= ignition coil 4= hopefully you wont have to go there take the compression of the cylinder if compression is good check power to injector if everything good change injector hopr it FIXYA our problem pierre

What is the make and model number of your set? I can help you but I need that info, So I know where to start.