SPARK KNOCK will not cease...even with tune up!
I am getting a bad spark knock with the recommended 87 octane even when I have had a BG air/induction cleaning and major tune-up...mostly happens upon acceleration or when engine has a load on it (like going up a hill). Computer has been reprogrammed and we don't know what else to do with it. I have the 2000 JGC Laredo 4x4 4.0 liter and the dealers are puzzled like I am...please help or any suggestions.
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