Slant 6 Turbo 68Dart Project

RustyPlymouth said

try spraying around the runners and anywhere else you might suspect with some carb cleaner and see if it revves up a little or smoothes out a little.

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This is my next step actually, was to do the carb cleaner thing. The only reason I suspect the manifold, is when I push down on it, the noise is quieter, that doesn't necessarily mean anything, but we'll see.