2000 sentra idle problems?

hello, my step-son's 2000 nissan sentra w/1.8 engine idles a little rough at 750rpm then real rough at 1000-1500rpm and then it smooths right out. he said auto zone got 2 codes with the code reader 303 and 1493. does anyone know what these could be and does anyone have a repair manual for this car,or know where he can get one, it seems for some reason a hard one to find? thanks alot Randy

P0303 Cylinder 3 Misfire Detected. i have no idea what 1493 is, if it is even a valid code.

i have had problems find a repair manual for my 01 sentra as well.. chilton nor haynes make one.

well, they posted it on another forum. sr20.net i think when i searched it. if u want it u gotta buy from dealer for like 400 bucks....fuck that.

ill go at it blind before i spend 400 bucks to get it from a dealer.. i just wunna know why no one makes one..

ill go at it blind before i spend 400 bucks to get it from a dealer.. i just wunna know why no one makes one..
I bought my repair manual on ebay for $7 :-) sweett stuff!