Join Date: Jul 2006
Location: Northfield, Illinois
Do you have a support to the outside of the Webers to the engine mount on that side? Are you using a "converted" FI manifold with "O" rings in place of the insulators / isolators? Have you checked the screws position; are the springs weak enough that they can move? Any of the above will cause this problem, you may be just a little bit lean on the idle jets, maybe one step.
Engines in a fairly high state of tune sometimes do this with temperature. My GTA engine likes a little change above 80 degrees, and again at about 55 degrees, but it is not a street engine. Constant Weber adjustment usually indicates something else is wrong, from air leaks, bad fuel, incorrect jetting, and so on. It can be plugs, wires, distributor, a weak coil, valve clearances as it will affect cam timing and so on. Most often not the Webers. You adjustments are a band aid for another issue.
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