well if its a lean a/f mixture there are only 3 places to look first your air intake check the mass air for any obstructions or failure second check the inlet air temp sensor if its close to heat cause if it reads hot it will lean it out third if there is any rough running at idol check the iac idler air control valve for carbon build up. the next thing i would check for is a clogged fuel injector if they are not supplying the right amount of fuel that will throw a code and finally the worst one check the o2 sensors you can pull them out and clean them because i have had a lot of cars come into the shop over the years that have had codes thrown due to the o2 sensors i would check the o2 sensors first because they regulate the a/f for the on board comp use a little carb cleaner ( i use 2+2 myself) and give them a good scrub these are all cheap fixes and if you have a pep boys near buy they will clear the code for free if you do not have a scan tool. word of caution though be very careful with running the car lean it will cause a lean misfire and could result in engine damage i will check the thread to see how you are doing and any more questions feel free to ask