this is not the first time ive had this problem i recently just went mpfi and before i went to mpfi i couldnt rev my car past 3.5k so i thought it was my dizzy so i went mpfi with the new dizzy been driving around a little bit with no problem then starts to lose power as im passing somebody, reset my ecu then its fine until i rev my car high.

anybody have any suggestions what it could be? there is a code but its not flashing on the ecu.

 

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