I have an all motor LS build, and I am 150 miles in on my break in. I have worked on the idle everyday now for 3 days. It sounds ruff like a diesel engine, and has cut off about 5 times. When I am sitting at a stop light and rev real quick to about 2k and let off. 1 out of 10 times It just idles down and cuts off. Any advise to fix this minor problem???? Edit: Sorry my CR is 11.4:1 and I run 93 octane gas.