I have a 2001 NIssan Sentra GXE with 125,000 miles on it. I recently took it to my mechanic because the car has rough idle( one time it started shaking violently while at a stop light). Well to make a long story short, he did a compression test which came back that I had 140 pounds of pressure in cylinder 2 and 3 and cylinder 1 and 4 were fine and that the head gasket needs to be repalced. The cost 1000 dollars. I told him I would get back to him. I don’t know what t do, this is my first car, I 've had it for two years and have had no major issues with it. Part of me wants to get it fixed but the people I’ve talked to say replacing the gasket is like opening a can of worms. I could purchase another used car but that will eat up all of my savings and I am not sure I am comfortable with that.