Weird "sputtering" at 5000 rpm. 90 Turbo [Archive] - Toyota MR2 Message Board

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The other day I was cruising along with no issues. I slowed down for a truck making a turn and once it was clear I floored it like any other child would do. I was in second gear and when the rpms hit 5000 rpms, the engine began to sputter. There was no backfire or crazy noises. I pulled the spark plugs and replaced the copper ones with iridiums. The car sputters as mentioned at 5k rpms. However, once it reaches 6000 rpms, the car really pulls. The ride is smooth at that point and there aren