There should be a recall on 2.7 engine

I just joined this site and it is great!!!!

I have 2000 intrepid with 2.7 engine..Not knowing what sludge was, while on the highway the engine went. I took it to a dealership they state it would cost close to $10,000 to get it new engine and of course I said hell no!!! The car wasnt worth it (this happened 2002 64,000 miles). I found a used engine from another chrysler car with 30,000 miles for $2700..after belts, new computer, oil and labor the cost was $4428..Also i replaced all the sensors, catalyst converters, electrical part of the transmission...Whoa im broke!, but wait im not done..now the car shakes when I brake and there is a loud humming noise when I accelerate, Im not sure what this trouble is please help. 84,000 miles on car now..Any suggestions will be appreciated.

The vibration when you brake is warped rotors. The humming sound could be worn/imbalanced tires, worn balljoints, tie-rod ends, control arm bushings. See if you can find someone who can pinpoint where exactly the sound is coming from. As I mentioned, it could be a wide variety of things.