Hijet 1300 efi cutting out HELP !!!!

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I have a 2000 hijet 1300 efi
which keeps cutting out.
i have had a flash test done at a local daihatsu garage and they came up with the water temp sender. this has been replaced with a new one and we still have the same problem ???
every time you clear codes it comes up on flash test its water temp sender have checked new temp sender and thats fine ??

Engine cuts out when at working temperature only for a split second and then runs fine until you accelerate or change gear(runs fine when cold) and occasionally when pulling up to junctions cuts out completely then will not start for ages like its flooded.

have checked wiring loom and all junction boxes i'm at a total loss !!!!

HELP
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