2 days of hard running beforehand will simply break down your muscles. it will not have any training effect, but it will make you tired and sore. it is also the most likely pathway to getting hurt because you will enter a max situation already broken down.
think damage control. you are better off with doing easy aerobic runs. to get your legs moving and clean up your form do some quick accelerations (as in around 5 from 0-95% for a short distance) at the end of the runs to smooth out your form a little. in the past, i have seen running improvements even when i don't run at all because of injury.
your legs are not weak. your cardio is good and you only stopped running a month ago.
what race are you doing? i suspect i know which one it is.