1987 Chevy Monte Carlo FUEL INJECTION PROBLEM

Hello, I just bought an 87 monte carlo, but cannot get it to stay running without constantly pumping the gas pedal, I've tested the injectors, the iac valve, the map sensor, egr valve and the pump is pumping fuel. I noticed when we took the vacuum line off of the map sensor it ran quite a bit better, but still wont idle or run real well. We also checked the codes and its shootin a 34 and 35. I did replace the map sensor and it made no difference. I've been through repair manuals also, and i'm just stumped? Any ideas would be greatly appreciated. Thanks, Brent