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I had another blazer before this one and it was doing the cough cough thing when it would get up to normal tempature. I called my grandpa, a chevy man from the begining of chevy, and he told me to change the ignition module. He said there is a jell stuff between it and the distrubutor and if that brakes down then it wont work right. I went to get one, Im a woman, and was told OH NO it cant be that its this...... Over and over and nothing they were selling me fixed the problem. Finally after about $500 I bought the $40 part. My husband put it on and BAM the problem was gone. Should have listen to grandpa from the start!!!!! GOOD LUCK!!
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