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I have done quite a bit of research on plug gap, here is one of many explanations I have found. It works for me, I have more power,better mileage,smooth idle,no stumbling on incline and I use NGK. GM had a drive-ability problem caused by the big gaps with the Vortecs in 96. Sloppy...

I had the same problem. The shroud sticker said 60 on spark plug gap. Read somewhere that this was wrong and 45 would work. I tried it and no more stumbling up an incline and gained mileage.