Problems for specific Toyota Tacoma years:
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Most reported 2000 Toyota Tacoma problems
The Throttle Position Sensor can get out of adjustment due to wear in the throttle body or due to carbon build up. This will cause the idle timing to advance more than 30 degrees which will cause very high HC and NOx emissions. Conversely, the Throttle Position Sensors can wear out and not properly advance the timing which causes a lack of power and poor fuel economy.
occasionally my check engine light comes on saying the catatlyst is below the threshold but when i smogged it the other day it still had numbers even far below the average so it has better emissions than average. problem fixed by just resetting the light