Hello! So I'm plenty familiar with tuning carb'd engines but with this fuel injected stuff I'm a bit lost.
I needed to replace the intake gaskets on my 1998 Blazer with the 4.3 so I pulled the thing out and replaced all the gaskets. But because I'm an idiot, I said, "hey, why not a cam?" So in went the Comp 260/266. Which also meant I had to change rockers, so it got 1.6:1. Also some shorty headers just for giggles.
So now it's running way lean according to the spark plugs and has a light load misfire when warmed up. Scanner shows the fuel trims around 20% if I'm remembering correctly from the last time I looked at it.
I have an MPVI2 now, where would be a good place to start dialing this thing in?