have a different ecu to swap? I have seen this with ka's before. the ecu woudl warm up and have a certian circuit seperate and then it would die. also seen an sr ecu that would run fine but when you went to turn the car off like you normally would it would simple stay running. that was a bad ecu as well.
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RIP my very best friend. DJ aka djzstang1 you will be missed dearly. I love you bro.

1995 240sx se
1992 240sx
1990 240sx se
1991 240sx hicas sr20det MDX
1991 240sx project coupe
1990 240sx drift beater hatch
1993 240sx sr20det