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Hey sambo
I've had this issue before on an old Datsun
I wired up a turbo timer and it happened to be in gear when I was testing it
Went from ign to off and car started and rolled back abit and I just got out of way

The problem was ignition key switch etc etc

The contacts in back of key was touching start as u turn key back

If your car is regoed then just fit a fancy start switch button in the dash