Why does my car idle really high?

When I pull the mass air flow sensor the idle drops too low but doesn't die? My Thunderbird used to have a high idle until I pulled the mass airflow sensor and now that it's been sitting the battery died and I charged it but now the cars gauges and lights flicker and the car won't start anymore. Should I buy a new idle control valve and a battery or something else. Where can I get the computer scanned?