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1994 pontiac firebird SFI will not start engine turns over

\015 I have a 1994 pontiac firebird SFI it will not run,the engine turns over and there is spark(little and yellow)but it just will not crank.I have replaced the fuel pump and fuel filter and the fuel pressure is now 50 pounds at test port.It had 0 and then i replaced the fuel pump and fuel filter and i have 50 now.What could it it be?The previous owner changed the cylinder for the key and replaced it with a cylinder that does not have a chip in it but the check engine light is not on and the security light comes on and then goes off.Computer?coil pack?jumped timing?\012thanks\012what could it be?\015 Posted / edited by AnonymousUser on : 25-01-2021

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