Quote Originally Posted by Caddy Dad View Post
I just got my Mk IV with BPE 347 Holly Sniper EFI out on the road this week. She's running great. Not much popping etc when I coast down a hill. However, I do have a an issue where the RPM will almost drop to zero and then recover when I push the clutch in when coasting up to a stop. This seems to be a common occurrence with Snipers and there are multiple threads on the Holly Forum for me to research, but just wondering if you also ran into this issue? If so, how did you solve it?
Thanks!
I had this exact problem. I now have my desired idle speed set at 800 and set the IAC exactly according to Dave/Holley's instructions. My issue was that the IAC was set too closed and I needed to open it up a smidge. Make sure that you fiddle with it set up the way to plan to drive on the street. What messed me up was that I originally set it up without the air cleaner on. After putting the air cleaner on, a slight restriction was added and the throttle blades needed to be opened just a little to compensate. I have 3700 miles now and it runs great. I am a big fan of the Sniper. From sea level to 11,000 feet on a cold morning, the car starts right up and drives great. I average 17-19 mpg and even got 21 on an extended drive at 65 once on my 347.