I read Makku's sticky but I need some more specific information.
Here is the problem, I have been getting some really shitty gas mileage lately. I put half a tank of gas in my car yesterday and since then i've driven 69 miles (so says the tripometer). I have used in that 69 miles a quarter and 1/2 tank of gas. I normally get at the LEAST 130 miles per half tank of gas. I have no idea why but this just started about 3 weeks ago.
Note: There has been a grimey, greasy looking substance appearing on the outside of my block and transmission. It looks like black sludge but i'm not sure what it is. My idle has been jumpy lately too and on the way home today I got as low as 200-300rpm it jumps in between that and 1000.
Here is the problem, I have been getting some really shitty gas mileage lately. I put half a tank of gas in my car yesterday and since then i've driven 69 miles (so says the tripometer). I have used in that 69 miles a quarter and 1/2 tank of gas. I normally get at the LEAST 130 miles per half tank of gas. I have no idea why but this just started about 3 weeks ago.
Note: There has been a grimey, greasy looking substance appearing on the outside of my block and transmission. It looks like black sludge but i'm not sure what it is. My idle has been jumpy lately too and on the way home today I got as low as 200-300rpm it jumps in between that and 1000.