Trouble code P0121 means: Throttle Position Sensor Voltage Does Not Agree With Map Sensor. You can replace the TPS for @ $30 from Autozone. Please vote appropriately and leave a comment. I hope this helps and Good luck.
Hi there: i did changed the throttle position sensor and the problem still there, and the idle is up and down and i change some of the vacuum lines too, but it could be a vacuum leak also which I have been checking and it could be that a cylinder has low compression too, so I am wandering what is really wrong there.
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Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance
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