Popping and stuttering after Efi install and rebuid

Phreakish said

I had a minor exhaust leak and it did cause exactly what you're experiencing. Fitech efi with timing control.

Also, a bad o2 sensor can do it. I've had them go bad over that winter. They can be bad and still read too, but they get slow and confuse the ecu.

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I'm thinking this may be the problem now otw to work today I didn't get any reading to my dash for the afr. It did do this before but only for 5 min maybe thought it could be just a lag in the dash software for a minute, but no ready for 25 minutes has me thinking they sent me a faulty o2 sensor