Djet Mixture Issues, Runs lean then rich Options

[dlee6204]

I'm attempting to get my car running correctly but am seeing some odd results in the AFR. Im seeing two extremes in the AFR during the warmup process.

Backstory: I acquired a 73 2.0L that I've known for some time. The previous owner converted to carbs because the original FI wouldn't run quite right when warm. The car ran great with carbs. I refreshed the motor, rebuilding the top end, and made it a 2056. At the same time I installed the original FI to get it working again which is the stage I'm at now. I'd like to see consistent results before I start tuning the MPS for the larger displacement.

During the first 6 minutes of start up/driving the cars runs way lean. Idle mixture is 16+. Cruise afr is 15+. WOT starts at 11.5 and ends at 13.5ish.

After 6-7 minutes of running it's like a switch is flipped. Afr reading across the board is less than 10.5. I can get it to idle around 12 but that is with the ECU knob at full lean

Some more notes....

-CHT is new. Measures approx 2200ish at 70 degrees. Once warm it is approximately 50 ohms.
- Intake temp sensor measure 180ish at 75 degrees.
-Wiring harness is a brand new refurbished harness from Bowlsby
-Mps holds vacuum. I even opened it up and checked the diaphragm. No cracks. I also checked the resistance of the coils and it checked ok.
-ECU matches the MPS
-Injectors were sent out to be tested cleaned.
- I've driven maybe 20 miles on this setup since refreshing the motor.
-I see the mixture change after 6-7 minutes whether it's idling or I'm driving
-I can plug the AAR and I still see the same results.
-I adjusted the TPS with no change.

Anyone have any additional advice or theories as to what's going on?