R33 GTS : Shuts off after 3mins?

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So I've been tinkering on this customers R33 for some time, looking for any inputs, I'm stumped.

Car had a aftermarket japanese remote start which I believe had a built in turbo timer. Its an OBDII R33 GTS. I have removed every aftermarket component thats electrical and unplugged a million different things on a guess. Also changed ECU, changed MAF, changed coolant temp sensor. Car will run perfect, starts perfect, runs for about 3.5 minutes and immediately cuts off. Will start RIGHT back up perfect. Does the same thing each time.

Any ideas?

I have removed all the interior and dug around in the dash for hours, there's nothing left that's aftermarket. Wiring on oem plug for ignition switch is untampered.