Random Backfire on Gen4 3SGTE (help ideas) [Archive] - Toyota MR2 Message Board

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I have a gen4 3SGTE turbo in my 91 MR2 race car. I am having an issue that I am trying to diagnose without any luck yet. Any ideas would be welcome! Issue: * Random startup backfire -- sometimes it just cranks and cranks and then backfires and shoots flames out the exhaust. I turn off the ignition, turn it right back on and everything is fine. Happens randomly. * Under boost backfire -- When on high boost, sometimes it will backfire out of the exhaust, which will shut off the engine all