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A few years ago I found an Alfa spider project car, 1985 with Bosch L Jet injection. After fooling with every sensor, injector, .... for several months I ditched the entire system and went with a Weber twin carb setup. Simple.
Last year I had the engine of our '75 911S rebuild for $15.k (top end, head studs, ..) it has been running great until I filled her up with Sunoco high test a week ago. Probably not the fuel but now she will not idle, the bucking, severe hunting nonsense. I tried the carb cleaner method with 0 results. I am looking at a smoke generator or CIS pressure tester. I know when these systems are working they are the best for street use, but otherwise can be a source of frustration. Perhaps back in the day more techs were up to speed with these older electronic fuel systems, but these days ???
Good luck, I will bet the problem is reasonably simple, just challenging to locate it.
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