what causes bucking
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#15
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With the bigger cams, reducing the low load low rpm timing helps the bucking a bunch.
Stock, the timing in that range is 41 deg. I start with that range reduced to about 38 degrees, and have run em as low as 34.
You also have to make sure the fueling is close too. If the trims have to adjust a bunch it'll make it worse. You'll always a little bit of low speed surge/buck, but if tuned right it will be real close to stock. You can get a bone stock one to buck and surge if you lug the motor low enough.
Do you have tuning and logging software, or did you send him your PCM?
#17
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i still fight with mine sometimes with that... for mine, i'm either running too rich or theres too much air getting in, because it doesn't go away until I'm at a full stop for over a second or two, when it does it