rpm increase when brake applied - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72GMC51 · 11-05-2007, 10:15 AM

Has anyone ever had the idle increase when you apply your brake.
I have a 350, with a eldelbrock 1406 600cfm cab a weind dual plane manifold, with a 1" spacer, headers, GM performance HEI timing set at 12 degree, auto cam spec int 214 .443 107 lobe center, exht 224 .465 117 / 112. The problem I am having is at idle if I step on the brake the idle will increase 2-300 rpm. I have check the power brakes over and there are no vacum leaks. Also it has a vibration at 1800 that if you hold it there it will come and go. Also when driving it it seems to miss and runs like it is fighting itself. I have tried almost every thing plugs carb tuning etc. I just cannot find a problem.
Thanks
John

11-05-2007, 10:15 AM	#1
72GMC51 72GMC51 Join Date: Jul 2004 Location: Minnesota Posts: 233	rpm increase when brake applied Has anyone ever had the idle increase when you apply your brake. I have a 350, with a eldelbrock 1406 600cfm cab a weind dual plane manifold, with a 1" spacer, headers, GM performance HEI timing set at 12 degree, auto cam spec int 214 .443 107 lobe center, exht 224 .465 117 / 112. The problem I am having is at idle if I step on the brake the idle will increase 2-300 rpm. I have check the power brakes over and there are no vacum leaks. Also it has a vibration at 1800 that if you hold it there it will come and go. Also when driving it it seems to miss and runs like it is fighting itself. I have tried almost every thing plugs carb tuning etc. I just cannot find a problem. Thanks John __________________ 72 GMC 2wd 1/2 long 350 700r4 A/C PS PB 4:10. Are they ever really finished



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