Things that you need for the engine to run
1- Fue
2-Air
3-Spark
4-Timing
5-Compression
your error codes will help you determine which to address
If u have any codes have vehicle scanned that gives start point didnt clarify why fuel pump changed -check 4 fuel at throttle body unit could be air bound if fuel start with ur spark plugs 4 spark no spark go backwards thru ignition wires distributor coils etc could be anything but good luck
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