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

Thread Tools
Show Printable Version Email this Page
Display Modes
Switch to Linear Mode Switch to Hybrid Mode Threaded Mode



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.