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Message: <blockquote data-quote="shovel" data-source="post: 1539959" data-attributes="member: 29855">I'm guessing that's like the high idle thing that a lot of people struggle with when trying to work with a stock ECU and a 30 year old Mustang with various minor mods.    My opinion is it's just not worth trying to work with the stock ECU anymore,  we used to not have a choice and then later with stuff like the quarterhorse (RIP) it was nice to have some more control.    But now the low hanging fruit is just go to speed density on a ms3 with widebands.. that modernizes engine control and as far as I can tell those little quirks vanish.   It's a bit more money up front but I think in the long run it's a whole lot lower cost.    Obviously that only works on cars/locations where emissions testing permits it.. in your case with a 69 Datsun that's not likely a concern.</blockquote>