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Re: '05 5.3l mysterious misfire
Wanted to update this thread in case anyone else ever has this problem. The issue the entire time was tuning. My mail order tune wasn't cutting it. For the cost of in person wideband O2 sensor tuning I decided I'd go ahead and swap in an LQ4 before I shelled out the cash for a custom tune. Couldn't be happier with the results. Truck is a tire roasting monster now.
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'59 chevy apache: camaro clip, LQ4 with 5.3l 799 heads, Vengeance Racing tune, LTs, CAI, 4l60e, 8.5" ten bolt w/ truetrac
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