I have a 2001 Tribute that has started to idle really hard and shakes the entire car like it's in the middle of a riot; the shaking also results in electrical power fluctuation (lights dim in and out). Yesterday one of the shakes was violent and now my check engine light is on. I also have my oil light coming on when my rpms go under 1250.

Any ideas on what I should be looking for to fix?

 

Start with the code. Get it read and report back. Most any part stores can read them for you free of charge.