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Message: <blockquote data-quote="toyman" data-source="post: 1028843" data-attributes="member: 10841"><p>Don't change the injectors. Fouled plugs would seem to indicate too much fuel already. Also, the PCM is adding fuel based in the MAF signal as well. Have you cleaned the MAF with MAF cleaner? Needs to be done if it has been a while. O2 sensors have a finite live and by about 60k miles they generally start to fail. Did you clear the old codes? You want/need to know what is currently being logged by the PCM. Check the ground from the battery to the engine and engine to chassis. They need to be absolutely solid for the engine sensors to function properly. The PCM controls the timing not the TFI. Timing is mapped based on load and rpm.</p></blockquote><p></p>