I have a small block with an edelbrock tunnel ram and two Holley 600's.Runs great idles good,slight stumble on acceleration.I checked the plugs and they are black.I'm running a really hot ignition and platinum plugs,thats why it runs good.What can I do to lean it out?If I spray carb cleaner in the carbs,there is no change in rpm,I thought this was good.Can I turn the mixture screws in or do I need to change jets?I believe I have #66 jets now(I bought the setup used}.Your help is always welcome,you guys have brought me through this project to this point.

Runs great idles good,slight stumble on acceleration.

No replys?? well I'm no carb guy or anything but if it idles smoothly I would not touch the adjustment screws, maybe too much fuel too soon.Do both carbs open at the same time or one before the other.Try adjusting 4-barrels to open later and see if the stumble goes away. If plugs are rich all the time maybe a jet size reduction is in order.Try one thing at a time. Hopefully someone else will reply here. Dave

[This message has been edited by dsr (edited 12-28-2002).]