ENGINE PROBS AFTER MODS!! HELP!!!

I changed my heads, intake and headers last week and when I start it i get a backfire and a low idle. I checked and rechecked the plugs and wires and they are in the right order. Timing seems to be right on. I pulled the upper manifold again and saw that #5 is the suspected backfire. Not sure if all my vacuum line are correct though. I tried looking at the diagram on my hood but can't figure it out. The new parts are Trick Flow Track heat Upper and Lower Intake, a Summit 70mm Throttle body, and BBK shortie Headers. ANY suggestions would be a help.
Thanks!!!:shrug:
 
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