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Re: 89 Lesabre, long start, popping at hwy speed
Im betting on the timing chain.. sorry..
With that many miles.
To backfire out the carb/intake.. a valve has to be open when the spark meets the gas either by valve timing or bad valve or spark jumping to it at the wrong time.
Good Luck
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00' Park Ultra 
94' Park Ultra
94' LeSabre
96' LeSabre 
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