Mechanic said the rattle is coming from the passenger side cat - and other than one time they could not replicate the spark knock. The odd thing is it will only spark knock/diesel when in gear it can idle perfect and goes through the RPM range fine when in park or neutral. If it's in gear say at a stop light... if you press the gas slowly it'll hesitate and you'll hear the dieseling noise. It will also drop RPMs to 500 randomly when stopped in gear.... thoughts? If it was an issue with the cat I'd assume it would have the issue regardless of being in gear or not?
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