U.S. GDP Growth Slowing Down, Sell Stocks

The Chicago PMI just went in contraction from 52.5 to 49.0. This confirms all the bad news we already had in the previous months.
I expect that with this lower PMI, the ISM manufacturing PMI composite index (NAPM) will go down too.
And with that drop, the GDP growth will most certainly drop too. I would be very cautious if you are still buying stocks, thinking it will go higher.