2001 Pontiac Grand Prix Q&A

2001 Pontiac Grand Prix Question: Changed crankshaft position sensor now wont start

I changed my crankshaft position sensor now my car will not start. it will crank but will not fire up. I checked using a spark test lamp, i am getting power to my spark plugs but the car will not start. i tried putting the old one back on still had the same result. What do I need to try to hopefully get my car to start? -
Answer 1
scan test for codes and check fuel pressure -
Answer 2
Then put the old one back on. -