Only if it is before the O2 sensor. I will asume this is a speed density EFI meaning it does not have a mass air flow[MAF] sensor- I would look at the manifold absolute pressure[MAP] as it is the main source of info for the ecu for fuel along with the O2 sensor. ck the wire connection and the vac hose. if it is a MAF system the same holds true for the MAF ck the intake hoses and MAF connector.