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i have a 2001 frontier SE crewcab 4x4 automatic it has 195000km. i do all oil changes on time but i have started to notice a roughidle when at stoplights also gas milage isnt the greatest. thinking its time for a tune up. i have an idea were to start with air filter, new spark plugs but not to sure were to go from here. any help would and ideas would be great

thanks guys
 

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2005 KC SE 4x2 4.0L 6spd body dropped on 2s
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plugs, wires, fuel filter, cap, rotor, clean mafs, check air filter, and check exhaust manifolds if they are cracked bad the engine will run pig rich more so then they normally do. Did you do your timing belt yet? water pump?
 

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plugs, wires, fuel filter, cap, rotor, clean mafs, check air filter, and check exhaust manifolds if they are cracked bad the engine will run pig rich more so then they normally do. Did you do your timing belt yet? water pump?
^this. are you the original owner? what major services do you know have been done?
 

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along with all of that you could give it the seafoam treatment to take care of any built up carbon
 
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