I need some help here! I have a serious stumble when I stab the throttle, in park , engine idling at 1k. If I ease the throttle up to even 2k and stab it, it stumbles all over itself. Drive the car and it stumbles if you try to hold the throttle steady. Like I said...I NEED HELP !!!!!!

Now to tell you what I got...

385 ci 10.6 CR
ProLine heads
Team G intake ( single plane)
Holley 750 DP
Holley ignition
Lunati 7101 cam

I have moved the timing from one end of the spectrum to the other. (and yes,... I know that somewhere around 38 degrees total is optimum)

I have swapped jets repeatedly, anywhere from 67p/78s to 84p/87s.

I have used every shooter I have from 25 to 37..and every cam except the black one.

I am pulling 12"vac at idle and have used 6.5 hiflo power valve to a 4.5 loflo.

I disconnected to secondary and still have the same stumble...I am getting a little frustrated and need someone wlses opinions,..even bad ones would be appreciated right now!

 

Im thinking that the problem is with your power valve. I am running a 4.5 in my engine (specs in sig), and will be trying out a 2.5 this weekend. I don't know too much about mechanical carbs, haven't had to get into too much. I was running a 650DP before this carb and it was a bolt and go thing.