Project Underfunded / next phase - LSx carb'd to LSx efi

[68GMCCustom]

Boy have I chased my tail on that one! Not yet....but I think I may finally know what it is.

I've been focusing the whole time on something being broken/wrong. Intake gasket leak, cracked intake leak, broken vacuum check valve leak, etc. etc. Then it occurred to me the other day that the tune may have the TB open too much (does idle high - ported/polished TB has a hole drilled in blade), and controlling rpm with fuel trims....and this is not allowing the engine to create enough vacuum? Maybe its been something as simple as the tune the whole time? Wouldn't that be a laugh.

I've been busy wiring in a new Autometer GPS setup for the speedo and a Painless Perf. GM genIV tach setup to run my tach. Had to drop the starter which requires loosening up the header and exhaust, just to get to the crank sensor again. Painless?
I've made so many changes to the electrical I feel like ripping it all out and going back in with new. Maybe when I paint. If I wind up finding a VSS solution coming off the trans then I'll decide if I want to sell the GPS or not. I decided I did not want to dedicate my diagnostic port just to provide rpm and speed...particularly when I can look at so much more data with the Aeroforce scan gauge. Anyway...been doing all that along with adding some turn signals (where the holes are) and a high beam indicator to the OEM cluster... since I'm not running with the OEM gauges so I lost those.

Anyway....all that's about done and I'm about to try my theory. Hopefully tomorrow.