So I'm hoping someone has some wisdom for me here. Was trying to dial in my MAF tonight after doing the "manifold switch" patch. My problem is that I keep encountering random lean spikes on the wideband. Typically, they're only one time per pull (3rd gear -- ~1800-6600 rpm), and usually around 3000-3500 rpm. Makes dialing in the MAF really tough in that region. It'll go from ~.75 lambda to .85 lambda or so when it happens, then the rest of the pull to redline is super smooth and my commanded vs. actual lambda are spot on.
This is on a '13 LS3 Corvette with a Magnuson Heartbeat @ 10.5 psi, headers, and ID850s, for what it's worth. I usually run methanol injection, but it was turned off and 10 degrees of max timing dialed in for this MAF tuning to keep things safe. My first thought on the spikes was that they could be misfires, but I didn't log any under my "total misfires" PID when the spikes were present. The spikes show up on the narrow bands as well, so it's not the wideband.
Any suggestions?