Hello and welcome to 2CarPros. Running lean on both banks is commonly caused by either a vacuum leak or by low fuel pressure or something like a MAF sensor that is contaminated or faulty.
The easy way to test for a vacuum leak is to start with a cold engine. Get a can of carb cleaner or engine starting spray. Start the engine and spray in short spurts around the intake manifold and lines. If you hear the engine suddenly change spray that spot again.
To check the MAF you simply remove it and use some MAF cleaner to remove any oil or contaminants like bugs or? From it. Reinstall and see if it is better.
Saturday, May 11th, 2019 AT 5:53 PM