Roush vs 427FE vs Keith Craft

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#38 (permalink)

05-16-2014, 07:58 AM

jhv48

CC Member

Join Date: Aug 2007

Location: Carlsbad, Ca

Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.

Posts: 2,617

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For those of you with a light surging (bucking) at cruising speed, that usually is the result of a slight lean condition. Try opening up the idle air screws a quarter turn and see if that helps. If it does, then screw them back in until the surge returns and then back them out slowly till it disappears. If it doesn't, take your primary jets up a size or two and re-test. Light cruising is generally on the main jet system.

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