NISSAN MAXIMA 2001 PROBLEM HELP ?

I recently got a Nissan Maxima 2001. The thing is that it runs fine in the night when it is cool. But in the day when it is upper 80°-90° i can let go of the accelerator and it’ll just go 40 mph and I have to constantly ride the brake. This only happens when it is hot out and I don’t know what could be the issue.
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