Some other thoughts. The EZL only picks out one of the stored ignition advance maps on that model. You still idle speed timing with the dist. From your description, I would also search for a major vacuum leak if crank position sensor isn't the problem. I'd hook up a vacuum gauge and see what's going on there. Some shops are finding splits and cracks in the big rubber boot between the plenum and fuel distributor assy. I haven't experienced iit yet. You might try carb cleaner or a smoke mavhine.

Good luck,
Peter

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