Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
At the risk of being rude I am making a separate topic asking for help Identifying these two relays under the right side of dash in corner behind glove box to left of BCM in a 2003 Chevy Venture. I think the 2 relays or at least one of them are anti-theft related. I have searched all over the internet with many keyword variations and have only found speculation that they are Retained Access Power relay and or anti-theft.