It's never a good idea to just replace parts to attempt a repair. First find out WHY the engine will not start. By replacing parts you have introduced other possibilities into the possible reasons for the engine not running. Always go back to the basics: Fuel, Spark and Compression. If you have the three in the proper timing, the engine should start. You did not mention if the engine "cranks" when you try to start it but since you claim that the starter is ok I'll assume that it cranks. Check to see if there is a spark. Pull a spark plug wire, either use a tester or connect a spare spark plug to the wire and set it on the engine block while you attempt to start the engine. If you get no spark, trace everything back to see if voltage is getting to the coil before replacing the coil. Same thing with fuel. See if there is fuel pressure to the injectors or if there is fuel at the carb if it isn't injected. Get a compression tester to see if something bad has happened internally. If the timing chain/belt has slipped and you have no compression the engine will never start. It's always a matter of going back to the basics.
Since you changed your battery and starter I'm assuming you are getting fuel and spark is your problem. You should check your starter relay, the wires from the relay to your starter, the wires from your battery to the relay, the wires from your locking cylinder to the relay, and your locking cylinder. You might also check your alternator. You can take it to a parts store to have it bench tested for free.
you need a new battery. if battery has been replaced and this still does not solve the problem, you must have had the bad battery for too long and it ruined the If the new battery doesn't solve the problem you can have check the battery cables, make sure they have a clean tight connection. Also the problem could be with your starter also.
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