Engine dies when putting it in gear

Then replace the tranny.

dirty throttle body, check air filter.

sound like fuel filter stopped up.if you have distributor type engine your idle speed could be too low and ignition timing off a little.

The problem seems that of a car in need of a good tune up. Anyway it's the first step before one can start a good diagnostic.

Sounds like there is a problem with the Torque converter in the transmission or Transmission itself. When you put it in gear it should initially go into neutral but occasionally the transmission will stick part way in gear and partially in neutral putting a load on the motor. It is not enough of a load to get the vehicle moving but it is enough to stall the motor. This could be a simple clutch adjustment in the Automatic clutch to a PCV valve issue to a need to rebuild the whole transmission because of a problem with the control body or transmission pump itself. Sorry for the bad news.

It sounds like that not only is the battery totally dead ,due to a high very internal resistance, but that the alternator has very low output. While car is idling in neutral, the alternator has just enough output to supply the ignition circuits but once in gear and the idle speed drops there is insufficient voltage to run engine so it stalls, It is the same when the lights are turned on as the alternator cannot supply enough to run lights so engine dies without enough drive for the ignition circuits. Try another battery or install a new one. Also have the alternator output checked as it could be the cause of the battery dying in the first place because it has not been maintaining charge as you drive. The alternator problem would be caused by either worn brushes and / or a faulty electonic voltage regulator which is mounted inside the alternator with the brushes.

You may need a new idle sensor. Also check fuel filter and spark.

In general, yes. This is a carb tuning issue. Another possibility is a vacuum leak somewhere, but most likely, it's a carb issue. You'll typically see your rpm drop a bit when you put it in gear, but that it sometimes stalls out points to a carb issue.

Your transmission torque converter lock up clutch is not unlocking, that kills the engine and is the cause of the OD light flashing.

Sounds like the lock up torque convertor in the transmission is stuck in the engaged position.There is a sensor switch under the hood that can be temporarily unpluged but leaving it unplugged can ruin the transmission. Take it to a tranny shop.