98 5.7 gmc stumbles code P0404

My 5.7 Vortex stumbles on light acceleration, 1100 rpm and I get a P0404 and just had the p0161 p0141 show up too. Other wise the engine runs fine, good power and starting. The P404 comes up consistently. I replaced the EGR last fall with napa part. Replaced: plugs AC delco, MAF, plug wires, Distributor and rotor, Cleaned the MAF. I will remove the Throttle body today and really clean that out too. :banghead: