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GM Merlin:
I'm having the same issue on my '03 Silverado with a 5.3. SES light coming on with P0157 suggesting fuel is too rich. Been doing this since 4,000 miles; has 8k on it now. Would a rich fuel mixture or high fuel pressure be a source of rotten egg smell out the exhaust or spark detonation sound during acceleration? I have both symptoms.
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