Help!!

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Ok i put a new fuel rai and a fpr on and im wating on my guage to get here for but anyways my check engine light came so i used a obd2 diagnostic scanner on my car and it said it was running to rich and it also said fuel trim malfunction i know how to fix it from running to rich but what is fuel trim malfunction??? Please let me know!!
 
hmm your car is just liek my old friends. he had a 99 Si with lots of bolt ons. you should get a little more suspension... it will ROCK. ( like struts and tie bars) also, a camber kit. Anyways to address your issue im not sure what those mean you should play with the FPR and reset the ECU. He added a fuel rail and his car was WAYYYY faster. Good luck bro
 
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