I just swapped in a new RMW 250 cam as long with a reman head, new rockers ect and runs great but keep getting s code po172 which is “rich mixture”. I also noticed at highway speeds I’ve lost a little vacuum. I guess that’s from the cam? And was told this cam would have a noticeable idle but sounds stock? What’s going on?

 

Check your timing.

 

it’s perfect