I'd bet the stumble is from a clogged EGR valve. LT1s are notorious for that, especially over 50K miles.
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Seeya,
Steve R. in North Jersey
'16 Go-Mango Dodge Charger R/T. It's so good to be back in a V8-powered, RWD car!
Former Toy - '88 Monte SS - had lots of mods...
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