what could cause my stang to run lean? only mods are in sig. 75,000 miles. fuel filter changed within 10,000 miles.

replaced cracked intake about 6,000 miles ago or so.

 

is it throwing any codes? 02sensors could be failing would be the onlything really if its mostly stock I would imagine. Could also possibly be your intake setup that changes your a/f quite a bit

 

replaced w/ stock intake w/ one with an aluminum crossover.

no codes thrown. arent the front o2's a pita?

 

pita as far as replacing? as simple as jacking it up and stickin a long thin flathead up the side of the tranny to release clip and they make a special o2sensor socket you can get a an autoparts store so you dont f it ^ when trying to take off and put on.

 

How lean?

 

i've had my spark plugs in since my intake replacement (6,000 miles or so) and the electrodes, or w/ the white tip is called, is still really white, no haze, glaze. but the metal prongs has a lil haze.

 

Get it on a dyno and check A/F.