Quote:
Originally Posted by jdentremont
I also had a slight rattle in the exhaust which does drone a lot so I got it all welded up a reputable shop and it sounds much better but still no change with how things are running.
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Someone on FB posted about a similar issue. The exhaust rattle was being registered by the knock sensors as a knock and lowered his IAM in a certain RPM range. The shop may have fixed the rattle you heard but it's possible you have others that are causing the issue