I have a '73 Bronco that I just swapped in a 351W. I bored it .30 with flat top pistons, P&P the heads with full roller rockers, balanced and blueprinted and an RV cam. I also installed the Edelbrock Pro-Flo MPI Fuel injection system that included an MSD distributor. Also in there is the MSD 6 off road box and Blaster 2 coil.

7At idle, the engine will run smooth for about 5-7 seconds, then drop about 500 rpm, then run up about 250 rpm above idle, then repeat. When it is cold, it will stall when the rpm drops until it warms up.

I was pointing fingers at the Edelbrock system, but my neighbor has done about the same exact things to his 351W, except he did a stock Ford fuel injection and he is having the same issues.

Any advice is greatly appreciated.

 

First off, let me say welcome aboard!

Secondly, considering what you have sitting on top of that motor, I would call the Edelbrock guys. Seems to me there is a computer/ecm issue in there where it is reading your flow data.

--Mike