wire tuck help

Hey guys gotta question for you all I recently started doing a wire tuck to my wagon and came across a problem. I have tucked my drivers side headlight and intake manifold. headlight works great but i plugged it back up to make sure that i did the manifold right..apparently not. the car will start and then quickly shut off if i turn the key all the way off it does it again. I think this might be due to me using a larger guage wire (its all i had) the harness consists of mostly 16 and 18 guage but i used 16 for my extensions even for the 18 guage wire. Would this cause this problem? im not lasy i did nurmorus searches and cant really fiind anything.I checked all the connections and everything is hooked up. car ran befor i did the tuck. I just wanna see if someone knows for sure before i redo the harness again Thanks for your help -Evan
Could this be a ground issue?
Could this be a ground issue?
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(im of no actual help)