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I recently did a 1997 3.4l swap into a 1994 3.0l everything is hooked up and done. For the wiring at the ecu i did my own hookups without an aftermarket harness converaion. It runs great just wont rev up any help would be great! New maf and the tps seems to work.
 

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Do you mean Top Dead Center?
DTC, or Diagnostic Trouble Codes. Check for codes stored in the ECM.
The 1994 was a OBD1 system unless you installed the entire harness to include the OBd2 scanner port..


Rev problems are usually fuel related, i.e injectors,fuel pressure,fuel filter.
Not sure if your 1994 3.0 fuel pump deliveres the same pressure that the 3.4 needs.
This may help with what I'm trying to say.
https://www.2carpros.com/articles/toyota-trouble-code-definitions-and-code-gathering-method-1990-1995
 
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