Hey guys im hoping you can help me with my problem. i have an 01 w/ 72,000 miles. im getting a code that says banks 1 and 2 are running lean. i changed the idle speed motor, but that wasn't it. when the truck is idling it is missing. its not bad, but it is bothering. does anyone know what it can be?

 

I think it's either your O2 sensors or it's a vaccum leak....Check for vaccum leaks before replacing 02 sensor's. Cheaper to replace hose than 02 sensors...

 

is there any method to checking for vacuum leaks? or do i just go on a mad search?

 

check maf i had them same codes replaced tons of stuff come to find out it was a bad maf. to check for vac leaks get some carb cleaner and spray it around the intake if the motor spits and trys to die their is your problem if it does nothing thats not it.