Just to clarify, the engine cranks over right?
If it is cranking but not starting it can be due to either lack or fuel or spark. It can also be due to low compression.
Best option would be to check few items to figure out what might be the cause.
First check to see if there is spark at the plugs. You can simply undo one of the plugs and crank the engine to see if it providing spark.
Here is a helpful guide on spark test:
If you have spark then check for fuel. Can you hear the fuel pump come on when you turn the key to the on position?
If the fuel pump comes on then you will need to check to see if there is enough fuel pressure at the fuel rail.
The pressure can be checked using a fuel pressure test gauge. That you can borrow from your local parts store to use.
Since this vehicle has been sitting for sometime it is possible to have a clog in the fuel lines. Could have a blocked fuel filter etc.
Please let me know what you find or of any questions.
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Thursday, September 23rd, 2021 AT 12:40 PM