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Q: Why am I experiencing Low gas mileage after changing my spark plugs?? on 2008 Ford Taurus

I have very little experience in working with cars to this point but i decided to give changing my spark plugs a shot.

The front 3 plugs were relatively easy to change, but in order to be granted access to the back 3 i had to remove the upper intake manifold. After doing that I switched out the plugs and put it all back together. The car seemed to be running fine last night, and this morning for that matter.

I noticed that my Mileage Per gallon reading on my car is significantly less than it was prior to doing my work on the car. I used to get about 21 MPG according to the car reading and now I am currently getting about 11-12 MPG.

Any ideas??? No check engine lights on or anything???
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YOY MAY HAVE A VAC LEAK AT THE INTAKE GASKET. IS THE RPM HIGHER THAN NORMAL AFTER REPAIR.IF ITS A INTAKE LEAK YOU SHOULD GET CODES LIKE PO171 OR PO174 SOON
I don't have a check engine light on as of now. RPMs seemed a littler higher initially or seemed to jump rapidly but not so much last night or today. Gas Milage seems a little better but not where it was.
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DRIVE IT FOR A WHILE AND SEE IF THE CK ENG LIGHT COMES ON. YOU MAY HAVE A VAC LEAK WHICH WILL GIVE YOU A CODE OF PO171 AND/OR PO174 LETS GIVE IT TILL MONDAY AND SEE
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