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Re: 78 Suburban surging then dies on long grade
I think 18 base would be fine as long as you are positive that you are only getting another 17 degrees out of the wieghts. You may want to rev up to redline and double check those timing numbers. Theoretically you should have around 25-28 degrees of wieght advance. Sounds like you are on track there. Be aware that the more timing at idle you add the harder on the starter so you may get some kick back warm if the starter is getting weak.
The module, according to GM, either works or it doesn't. In my experience they can go wonky and do wierd things as they get warm before they totally fail.
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