After putting them on the other day, I noticed one was completely flat when I pulled it from the garage rafters. I pumped it up and checked it for nails or anything stuck in the tread but all seemed well.

After 1 day of it being on the car it was flat when I went to go home after work. I pumped it up again and notice it was leaking a bit by the base of the valve where it seals on the rim, so I wiggled the stem a bit and it stopped leaking, as if it sealed itself again.

I took the tire off and Im going to watch the tire pressure over night. Do you think I should just take it in and get a new valve stem put in or is there a solution I can spray around the base of the stem to seal it again around the rim?

How much does a new valve and install go for normally?

 

I'd put it back on temporarily and see if it still leaks...you very well may have fixed it when you messed with the valve stem. If it still leaks after that then I would have it replaced...they should be able to do it pretty cheap & easily at a tire shop.