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Likely you throttle plate is worn, as soon as you increase the pressure on the folcrum that leads to the shaft your butterflys are vonnected to it opens an airgap between the shaft and the bore the shafts goes thru. This messes up the air fuel raio that is typicaly governed thru you air mixture screws from idle to 1/4 throttle, causing a stumble. REAL pain if your truck is a 4x.
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How do you lean idle circuit on a 650 holley?
Turn the idle mixture screw in to lean the mixture, out to richen the mixture.
Are the throttle plates supposed to be flat or at an angle in the idle position on a holley 650 doublepumper?
A slight angle.
Does a 1997 dodge ram van 2500 have an idle screw and where is it?
Idle is computer controlled, there is no adjustment screw.
How do you adjust 600 cfm holley?
The idle speed and idle mixture are the first things to adjust and are very easy. If there is an off-idle stumble or a bog, you'll need to make adjustments to the accelerator pump and possibly the power valve to suit your engine. Here is a link to a Holley manual that explains it in detail: http://www.holley.com/data/TechService/Technical/Carburetor%20Tech%20Info.pdf
Why does a 1996 Chevy truck 2500 shake in a idle and almost turn off?
it has a low idle. Can also be a vacuum hose leak.
What would cause a 1978 Datsun 280Z to idle at 2500 RPMs?
z idle adjustmentTurn the idle screw - on the intake manifold - clockwise to decrease rpm or counterclockwise to increase idle. You should also look around for a vacuum leak
What is the normal idle for a 2001 Chevy 2500 heavy duty?
Aprox 650 rpm in drive.
Why does your 383 Stroker run smooth at 2500 or higher but will not idle?
That's what they do. maybe check carb settings and such.
Where do you find the IAT sensor on 1997 Chevy 2500 van?
it will be in the throttle body iat stands for idle air control and its actually not a sensor its an electro magnet that controls what its named for good luck
Why does my 306 idle at 2500 constantly?
check the accelerator cable, i had a problem with this, and also had a split in my pedal at the same time
What would make my 2000 alero idle at 2000 to 2500 rpm's after driving for about 30 mins?
could be: sticking throttle linkage, idle air control malfunction, or in emission system.
What would cause my car to idle around 2500 rpm in 2006 Chevy cobalt I put in a new throttle body and took to dealership to relearn idle but idle is still high?
A vacuum leak could do that. Did it have a high idle before you changed the throttle body? Any codes?
