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2004 Tacoma 2.4L low power

04tacoma04tacoma Posts: 1
Base cab, 2wd, 240K miles
Mobile 1 oil since 12K miles, new plugs, 28mpg highway

Problem: Although my mileage is fine, the engine is putting out 15-20% less power than it used to. It's not using any oil, nothing (like brakes or drivetrain) is dragging.

I have not run a compression test; spark plugs were normal color (tan) when I changed them last month. Could it be a plugged cat? Any simple test for that? My O2's have been fine--no engine lites.

Any Toyota mechanics in the house?
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