Having a problem with my AAR. It fires up fine and goes to fast idle. Blip the gas and the idle drop down like it should. Begin to drive it all is well. But after a minute or two it runs terrible. Idles crappy, feels like it wants to die, and at low speed it kind of spits and sputters……. Not like its running out of gas but like its running too rich. This happens from 0 mph up to maybe 40 or so. Once the rpm’s are up, it runs great, just the lower end is the problem. All I have done is checked the float level and the idle mixture screws. The rear float was a bit high but the others were fine.

Do you have a power valve?

R.

What carb? You might take out the 2 idle mixture screws and shoot a 2 second blast of starting fluid into both screw holes. First count the # of turns to get the screws to lightly seated then unscrew them so you can quickly and accurately return them to their original setting

Might just be crap in the fuel that has blocked some of the passages in the center carb metering block, follows RapidRobert's suggestion that might help, at the same time screw in the fuel idle mixture screws on the center carb one at a time, if the motor stumbles/stall the Power Valve is fine, if idle quality pretty much stays the same with both screws in, the Power Valve is toast and/or leaking fuel via it's diaphram or gasket


Sometimes just a blast of compressed air in the idle mixture screws orifice after you remove the screw completely can dislodge crap, a clean idle screw passage can be determined by feeling the compressed air your blasting in the screw orifice and it's exiting the outer air bleed located in the carb's throat for each corresponding idle screw L/R....100-125 psi air won't hurt the carbs passages

Mike

My AAR does this also if I let it sit too long. The bowels dry out, the floats drop and the needles fall down causing the floats not rise when fuel is pumped in. This allows raw fuel to be pumped into the carb bores. You can see this if you remove the A/C, run the car for a few minutes, shut it off and look down the bores for fuel dripping. If it is back off the needle and seat until the float rises and then reinstall the needle and seat.

If it is acting up from too rich you might also check fuel psi/needle & seats/float saturation (pinhole)/needle/seat/float hanging up in it's travel, anything that might possibly be letting it recieve too much fuel. Keep us posted. EDIT at that point are you in the power circuit? (in hg level)

mine was running rich black smoke and all i did was adjust the floats..must of been sticking...it ran good all the time before