i have a question. my car is running real lean on the left side to the point where it doesnt have any power. i have changed the coil packs spark plugs maf sensor and throttle position sensor and added mil eliminators. does anyone have any idea what this could be. its a 1998 mustang with a 2003 motor long tube headers high flow cats and x pipe. would gladly appreciate the help [/align]

 

what injectors do you have?

 

as far as i know there stock.
Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1

 

thats the code it is displaying. but i changed the plugs yesterday and all and one side is brown and the other side where black.

 

change your o2 sensor

 

would that make my car run bad. everyone else i have asked said it wont make it run bad it would just make me get bad gas mileage. i just dont wanna keep spending money for stuff that doesnt work lol. if i do ill have a new car by then

 

yeah change out the o2's

 

ok. guess i will try that then. so should i ghange both of the front ones or just the left one thats reading bad