Malfunction indicator light -jeeps shaking

I have a 2006 jeep named libby. I love my libby with
over 200,000 miles on her. I know shes been guzzling
oil, but all of a sudden now shes shaking. The check
engine light is blinking, i tried turning the key 3times to
get a code, but nothing came up. When i let off the gas
or coast down a hill she seems fine, but as soon as i
put my foot on the gas she starts shaking and it gets
worse the faster i dri v e. Shes parked now, but i cant
afford an auto shop, i need help now. I have work
monday m O rn7ng, please help.