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Could be rather simple. The exhaust leak had the oxygen sensor reporting lean, forcing the ECU to pour on the fuel until it set limp home (out of range). Lots of replaced parts in your post but no mention of OBD codes or having reset the ECU trim. Lift the 25A fuse momentarily to reset the ECU. The "pink label" ECU enjoys its reputation of short life for a very specific defect that keeps it from energizing the fuel pump relay -- a different symptom altogether.
Do you have a Bentley?
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Art Benstein near Baltimore
Wisdom comes with age, but sometimes age comes alone.
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