Hello, and welcome! You will find answers to your questions here on the forum, BUT please do some research before asking for help as most problems have been worked on by one member or another over the years. Use the search box on the top right of the forum and place your mouse pointer over the "threads" just to the left of the box and click on google to get the best results for your search.
You should also become well acquitted with the section TSBs and Trouble Shooting. There you will find Service manuals and documentation is there for free downloads.
Also one of our members, one hundred80, has complied a great source of information also in that thread click here: INDEX