Thread: P0121 & poor performance after dyno tune

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  1. #1 Re: P0121 & poor performance after dyno tune 
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    I installed factory PCM and the issue has not come back. Any ideas on what in a tune could cause TPS issues?
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  2. #2 Re: P0121 & poor performance after dyno tune 
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    did you get the problem fixed i have a 99 gtp and i had a p0122 code replaced the sensor. problem fixed a week later code came back and i replaced it again. all went fine until yesterday i got a po121 pending code and i cannot figure out the problem any ideas?
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