2003 Chevrolet Cavalier Q&A

2003 Chevrolet Cavalier Question: my engine light came on i checked it with the OBD2 and the code is PO171andPO170

I just put a engine from the junk yard and it runs good and its nice and quite but when sitting at a red light it feels like it wants to take off by its self what should i check first? -
Answer 1
suspect a vac leak somewhere. if you have access to a smoke mach have them do that test and you will find the leak -