Bad fuel. Either drain and refill the tank with fresh gas or just get out on the highway and run it out with a couple ounces of fuel stabilizer added. Once it hits reserve fill the tank with the correct amount of fuel additive (I like Sea Foam).
Literally just bought this cover two weeks ago. I love it. Fits great.
https://www.amazon.com/gp/product/B01DUQQA2W/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1