Instead of always having the fish caught for you, how about learning how to catch the fish?
1). Go to
www.google.com
2). Type in "TIC valve dodge" and press enter/return
3). On that first page there should be a link about a 1977 Plymouth Volare and if a TIC valve is needed. Click on that link
4). Read that link
5). If it's still not clear, go back to Google and type in a few other words such as "emissions" and/or "Dodge" and click on those links.
Or you can use the search window on this site and type in "TIC valve" and on that first page a post by 'slantsixdan' describes what a TIC valve does.