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My 1986 900S has in the last couple of days developed an acceleration "flat spot" during warmup. When the car starts from cold it runs fine, then as the temp gauge starts into the bottom of the green area, stepping on the accelerator gives almost no results. There is no bucking, backfiring, or stalling -- it just doesn't have any get up and go. This will continue for several minutes, then as the engine temperature gets close to full warmup the problem disappears and normal operation returns.
The engine has a recent (rebuilt) AMM, and I did a quick check for loose vacuum lines but didn't find anything amiss. Any ideas what might be causing this?
posted by 209.92.60...
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