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Check your:

Distributor cap and rotor (Mr2 turbo's are well known for their ability to eat distributor caps alive)

Spark plugs (look for signs of detonation, burning oil, running rich/lean)

If you have detonation, turn down the boost or check your timing.

If you are burning oil, check your piston rings.

If you are running rich/lean, take off any aftermarket blow-off valve, and replace it with the stock by-pass valve. Also, check your MAF.

MAF Sensor.

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Q: What do you do about your 1991 Toyota MR2 misfiring once and a while?
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