backfire popping coming from exhaust [Archive] - Toyota MR2 Message Board

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hey guys how are you. as some may know my car has high idle and i cant figure out why. i managed to clean out the air control valve and it went down to like 1100 and now its back to 1500 and bouncing. it goes up and down up and down. i do notice its running really bad and weak and i have what seems to sound like a back fire! i have these popping noises coming from the exhaust. is this normal? what is wrong with my car?