Quote Originally Posted by RedHeartbeat View Post
Have you tried capping off the vacuum signal to the FPR? I don't think those things were ever designed to work with boost. Once you cap it off, run it for a little while and make sure the FPR isn't leaking fuel out the vacuum hose.
Yup unplugged it and it runs the same. The AFR goes lean when it runs bad. It goes way beyond the scope of the gauge.
The engine size being different made me think that at idle and cruising it wasn't getting enough fuel.