16V MFI CAL. EMISSIONS CEL WAS ON , CODE FOR MASS AIR FLOW. REPLACED IT AND BLACK SOOTY EXHAUST ,RAN ROUGH. Unplugged MAF, cel back on runs fine .replaced maf. new, same thing. new ecm, oxy, cts, ats. isc. cleaned egr. plug in maf. idles when cold but stalls when warm. Help I have had since 1996. Thanks Jay