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You advance the spark timing by loosening the 2 bolts on the distributor.. they hold the distributor to the engine.. loosen those just enough so taht you can use your hands to move the dizzy back and forth with a little bit of force.. Start the car up.. loosen the bolts.. and move the dizzy.. if you move it towards the firewall you are retarding the spark.. if you pull it towards the headlights you are advancing it.. Advance it out some and see how the idle is.. then tighten the bolts back up.. go for a drive see if you hear any pinging (valve clatter).. You will hear it on the decel most likely.. if you don't hear any pinging.. good.. and even better yet if your dieseling goes away or gets better anyway.. if it gets better and you still have room to advance.. then advance it a bit more and see how it goes.. I doubt leaning your carb out will do anything.. that is factory set and shouldn't be an issue..
When I had this problem I leaned the hell out of my Weber carb and all this crap and the dieseling wouldn't go away.. not until I advanced the spark timing.
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