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Hey,
I recently purchased my '84, El Chup. While the familiarization was taking place, I was rummaging around in the engine bay. I found that all 12 intake runner nuts were loose, as well as the copper/rubber pipe that runs from the back of the post AFM elbow to a vacuum line on the left side of the bay. All these leaks coupled with the stock '84 ECU meant that while in the warm up period it ran fine, but as soon as the warm up period ended it began the lumpy idle phase. My solution was to tighten all the intake runner nuts and to replace the rubber portion of the copper/rubber piping. I then replaced the CHT sensor and installed a Steve Wong chip. All these details coupled together brought the engine to a new level of operation, smooth even idle, and a absolutely linear power production from idle to redline. Previously the the power production was stepped, almost like a carb when the vacuum secondaries opened. Search my posts for a more detailed explanation of some of these fixes.
eric