I was driving on the interstate tonite when i noticed my afr gauge is sittin in the yellow(stoich)...so i boost it a little and it stays their. usually it goes green(rich) right when i boost it. and when i put it in neutral it usually goes rich too but was in stoich again. so i pulled in a parking lot and turned off all electrical stuff like lights and stero and it went to rich right away. do you think i have a bad battery or connections some where. or is fuel pump bad or o2 bad? sorry for all the ?'s but im just wonderin. also my idel has been pretty weird....jumping from 800 too 600 then back again . thanks for any help.

 

Is the idle pulsing?

How old is the O2 sensor?

 

idel sputters...it holds fine for about 30 sec then sputters to 600 then right back to 800. and as far as i know the o2 is still stock