Quote from kvn1 on September 6, 2024, 3:14 pm

Hi All!

I own a 430 Buick engine, stock.

My current setup includes

• Fitech 30003 system, along
  - with fuel command center 2.0 HPF-40004
  - Locked MSD distributor, FITECH VR COIL setup
  - msd-6425 coil

As per my understanding and the hours and hours of videos I looked at - all my setup is correct: IAC steps at 3-4 at idle, vacuum holds well, all electronic connections done correctly. I must notice I never checked for Exhaust leaks currently.

Engine fires right away, idles like a charm (expecially when IAC falls < 10).

My issue is that after pressing gas pedal (both short and longer periods):

• engine initially hesitates
• After pedal released engine seems to go in a crazy loop - initially lean (18-19, I've seen 20), sometimes pops on the back, sometimes just goes rich at 11-12. IAC get crazy at 50-70-80 values. This loops up/down until it stabilizes, sometimes is 5-10 seconds, sometimes requires a minute.

I've attached multiple logs - I think it is visble when the gas is pressed and the effect few records after

 

Any suggestion for fine tune up is welcome , thank you all