There are various reasons why a vehicle wont start. The two main reasons are fire(electric power) and gas. Check and trace these two properties first and there is a good chance you will find the problem. Make sure it's turning over fast enough. A weak battery or starter will just cause the engine to flood.
Most likely it needs new spark-plugs.
turn key over turn key over
Does it turn over? Does it have: fuel spark compression?
not sure why but if I turn the key wait till the fuel pump kicks off my cavalier normally does start right up
There is more then likely loss of compression, resulting from a number of reasons, do a compression test.
replaced battery in 1991 cad deville and reprogramed computer as car manual said. now car will turn over but not start
Do you have your parking brake on?
Does it turn over? Does it have spark? Fuel?
Engine seized?
bad ground
Start by checking your basics. Spark, fuel, compression, and air/fuel mixture.
You put the key in & you turn it & it will start.