It has a dead cylinder on the #5 cylinder. I had a compression test done and that is what the mechanic told me. I also unplugged the spark plug later on when I got home to see if the engine would change how is was running and it did not change when unplugged so I am pretty sure they are right. It runs down the road just fine it is just rough when its ideling and when your trying to go up a big hill on the highway. I have no problem with it having only five cylinders because it still goes down the road and I dont have the $1100 to fix it right now. It only gets 13mpg as well and that sucks. I dont think that its gonna hurt it to run on five cylinders but it would be nice to shut the gas down to that cylinder so I can have better fuel economy.:biggrin2::biggrin2: