5.2 magnum options
ok, stupid question is it possible I have an internal vacuum leak ( under the intake ).
could that cause the erratic misfire?
It is possible to get an intake leak on bottom of intake mating surface, which will cause high idle, poor acceleretion and typically, will suck in oil causing engine to smoke and use oil. This, if minimal, could possibly get better when warmed up as intake swells with heat but kind of a long shot. The intake gasket compression would tell you if that was happening or not.
You have never mentioned using a vacuum gauge on your engine, have you done that? What do plugs look like? Rich, lean, oil spots?
I am going back to old school tuning/diagnosis stuff here which needs to be done to find problem.
Another question but needs to be addressed, which pieces have worked previously, carb, dist, coil, intake, etc? Did this engine ever run right?
