Rough Idling After PI Intake Install

So I started my car today and it has a rough idle, no CEL. And smelled like gas for a minute. I had to use NON pi gaskets. Would that matter?

Well I drove it down town, and the rough idle seemed to quiet down a bit. Is the PI Intake suppose to make your exhaust louder? Seems like there is also a faint whistle upon acceleration. Am I just being paranoid.

Well I found a spark plug. if your standing in front of the car. its the second one back on the driver side. It was full of antifreeze. But its the only one. And I can smell a faint smell of antifreeze. But the NONPI gaskets covered up the coolant passages well. It was just the air ports that required RTV. Anyway I decided to romp on it before I found the plug and Heard a bolt or screw hit the road and a Check Engine light came on. P1401- DPFE Sensor Circuit High. When I looked under the hood I found that the DPFE unit had a pig tail unplugged. So I connected it back together, and the CEL is still on.