Pretty easy repair on these cars. Get a Helicoil spark plug repair kit, easy to find at your auto supply store. When doing the job coat the cutting tool with grease to catch the metal chips.I have also read where you hook a shop vac reversed to blow into the exhaust and turn the engine until the exhaust valve is open on the cylinder being repaired so air is rushing out of the spark plug hole. I have never done that. Just follow the directions on your kit and make sure to put some red loctite on the insert before putting it in. You must also make sure the hole is perfectly clean and also clean the new helicoil with solvent like brakekleen or the best is to use loctite primer after you have completely cleaned your helicoil and new threaded hole. Right after cutting the threads I unhook the coil and turn over the engine with the starter to blow the cylinder out, then I hook up the coil and start the car with the one plug still out to really blow it out good, then proceed with your cleaning. This is not the way some would recommend, some would require the huge job of pulling the head. I have done this job this way on many, many engines and have never had any problems.
Your choice, pull the head or just take a few minutes and use this method.
