351W erratic idle and loping

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Feb 22, 2008 | 05:40 AM

Stretchstick

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Joined: Feb 2008

Posts: 26

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351W erratic idle and loping

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.

Feb 22, 2008 | 09:50 AM

Mike G

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Joined: Nov 2002

Posts: 3,447

Likes: 1

From: Littleton, CO

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