This vehicle, according to Starsky in a new, additional post, says it’s a 1996 Bonneville with 200K miles.
What J.R. Hoyt said. I’d get the car jacked up enough so you can crawl underneath. REMEMBER: SAFETY FIRST! See where either plastic cowl or metal has been scraping. Exhaust system, also. You can see scrapes on the plastic cowl and you’ll see either paint scraped off or some clean, shiny metal with scrape marks. Figure out what’s being scraped and get back to us. With that many miles, my first suspect is weak shocks, but let us know what seems to be scraping. When you find a spot, don’t stop there. Look the whole underside over. It might be scraping in more than one place.