1999 GMC Jimmy has weak acceleration and jumping rpm's at 30-40 mph. Help!!!?

fezproductions

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It's a 4.3 L V6 SLE. My father and I just finished replacing the EGR valve but it doesnt seem to have helped. The acceleration was still very weak and the rpm's will randomly bounce at 30-40 mph when I am trying to get to 55 mph. Our neighbor's computer gave us a P0404 OBD code, which means (Exhaust Gas Recirculation Cicuit Range/Performance.) I just dropped 150$ on a new valve and the problem is still there. Any ideas? I'm not very good with cars but I really can't afford to bring it to the shop. Thank you. -Dan
 


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