On the 1998 Toyota Avalon, the P1300 is pointing to a fault with the Igniter. This is also referred to as an Ignition Control Module. Check the EFI Relay. Inspect the electrical connector and wire harness between the Igniter and the ECM. If the visual inspections check ok, most commonly, the Igniter will need to be replaced. You can find the igniter located on the lower left, rear corner of the engine compartment.
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