I had my car start for me the first time now it won't start it has spark is getting gas but won't fire and firing order is set correct 1-5-3-6-2-4 its a 82 280zx

 

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An engine needs PROPER air, fuel, and spark to start.

Have you verified spark and fuel at all cylinders?

 

Get your battery load tested. Be sure you have clean, tight corrosion free terminals on both ends of your battery cables. Be sure the ground (negative) cable goes to a bolt into the frame before going to the starter. grounding through the starter is not a reliable connection. Z's don't like low voltage. causes the electronics to act funny. it is possible to have enough amps to crank but not enough voltage to run the electronics. If you have one size fit all cheapo clamp on terminals they are a problem waiting to happen.

Clean the connectors for the maf or afm, ecu and tps. Deoxit by CAIG is probably the best connector cleaner on the market. spray with CorrosionX after cleaning and before putting together this will help prevent any further corrosion.

battery is the heart of your electrical system. if it isn't aone shape you got a problem