Technical difficulties, erratic and inconsistent behavior

Infiniti370z

Did you install a open loop or closed loop system? Also if you had any air/fuel ratio problems at any time due to the LPG kit you installed it could have over fuelled the cat and burnt it out causing it to melt and fall apart clogging the exhaust system, the pieces can jump around and make clunk noises while clogging and unclogging. Need to check a/f sensor readings.

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