How much negativite fuel trim is ok?

[Michael Sackstein]

I’m not sure on the specifics of that vehicle. Perhaps Eric might know. But I do know that a lot of times with those cars the fuel injectors get Carbon build up in them overtime and need to be cleaned. So my suggestion would be to clean those out. You can do it yourself if you have an air compressor, or you can take it to a shop and have it done. I believe Scotty Kilmer has a video on YouTube called “how to clean fuel injectors” and that shows how it’s done.