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I have a 2010 ls3 with atomic ls efi . I bought it many years ago , I know it has its down falls but it’s running the ls3 in my 69 c10 .
The engine has a cam swap , it runs well I had it on the chassis dyno last month and it made 489 wh hp and 443 tq. My problem lies with the atomic efi..... just off idle the spark timing falls down to the low single digits ... makes it run horrible, once the rpm goes above 1200 or so it’s back to perfect 👌.... does any one have any experience with these systems? I have a vid I will try to post thx Sean
Here is the ls3
Last edited by Gta; May 19, 2021 at 11:25 PM.
Reason: Added pic
I was wondering could a crank sensor cause this ? My local gm guy says he’s never changed one in a ls engine . I will try again to attach a vid could not get it to work yesterday...
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MSD atomic ls 
