Engine backfires when trying to accelerate

2001 LEXUS IS 300
186,000 MILES • 2.4L • 6 CYL • 2WD • AUTOMATIC
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MRDRAKE
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I changed the spark plugs, coils, and wires and the car still backfires when I go to accelerate. The car does have an aftermarket exhaust. It idles well when it is parked. Any help would be greatly appreciated.
Sep 4, 2018 at 4:31 PM
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STRAILER
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It sounds like you have a flat camshaft lobe on one cylinder. But to be sure can you please shoot a quick video with your phone so we can hear the noise? That would be great. You can upload it here with your response. Here is a guide to help you get started:

https://www.2carpros.com/articles/engine-backfires-while-running

Please run down this guide and report back.

Cheers, Ken
Sep 6, 2018 at 10:33 AM