Rpm gauge fluctuates after it is shut off
SOURCE: p2431 saturn ion
Why would you change fuel injectors?
Mail them away to be ultra sonic cleaned & tested only,
expensive proposition that was!
The MAP Sensor failed a test also?
I googled the P2431 & seems like a Secondary Air Injection
System Pressure Sensor ,hopefully that will get you close
Google it-- not easy to find some of those codes
Codes come back because you haven't found the fault
that set the code.
You working on things from yester year --not todays techology
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