Mine started to flicker to 36 every now and then. I did not hear any exhaust leaks but one of my header bolts was ever so slightly loose. I loosened up them all to examine the gasket which looked fine to me, retorqued down the header and haven't had a problem since. My read is this system is very sensitive to any type of leak introducing air north of the O2 sensor.
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71 Formula 433, Splayed cap 400 block, 4" stroke Scat forged crank, 6.8 Eagle rods, custom Autotec pistons. SD 295 KRE D ports, Old faithful hybrid roller, Torker II, Holley Sniper Stealth, Tribal Tubes, TKO 600, 3.73 Eaton posi.
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