With 16" of vacuum at idle I would think your a#2. Make sure your key power source has power in crank position.Hello chevelles.com even though I have a mustang this forum has a wealth of knowledge on fitech so I am here asking for help. I have a 351w with stage three track heat heads 8.5 to1 compression, super victor intake, custom cam motion camshaft with .565 lift on 114deg lobe separation (forgot duration) and pt88 turbo. any how I have the typical cold start issue where it will fire then stall but second hit it will stay running. I have selected cam 2 setting because I see 16" vacuum at 850rpm and iac set at 8. From what I have read when you have this issue you need more fuel on prime multi and crank 20f etc. From what I gather the range is -100 to 100 on the settings. When I opened the controller my prime multi is all ready at 259!!!! That's right 259!!! Does this mean I need to step up to cam setting #3. Thanks guys I appreciate the help and sharing of knowledge.
On the dashboard screen watch the RPM signal and make sure you have it cranking and run. See if when it false starts you loose the RPM signal.