Check your fuel pressure. For fuel injection, it should be 9-12 p.s.i. Your fuel pump is located in the tank. You might have to install an adapter fitting to hook up a pressure gauge. This can be installed inline at the throttle body or at the fuel filter. The fuel filter is mounted on the inside of the frame rail. You might just remove the fuel filter to see if you can blow through it. If you can't blow through it, it is plugged up and that may be your problem. You will need two wrench sizes to disconnect the filter 20mm and 16mm.
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1985 Chevrolet Monte Carlo (model since October 1984 for North America U.S.) specifications & performance data reviewSpecs datasheet with technical data and performance data plus an analysis of the direct market competition of Chevrolet Monte Carlo 1985 the model with 2-door notchback coupe body and V-8 5001 cm3 / 305.2 cui engine size, 134.5 kW / 183 PS / 180 hp (SAE net) of power, 4-speed automatic powertrain offered since October 1984 for North America U.S.. Specifications listing with fuel economy, top speed, performance factory data and ProfessCars™ estimation: this Chevrolet would accelerate 0-60 mph in 8.3 sec, 0-100 km/h in 8.8 sec, 0-200 km/h in 87.7 sec and quarter mile time is 16.4 sec.
I would first try a new fuel filter.
Look at the spray pattern of the injector(s) when the engine is cranking. If it is a fine mist cone spray pattern, that is good. If it drips, doesn't really spray down and out, the injector may be clogged-or partly stuck open with trash or debris.
If filter is good and injector spray looks good, just possible an ignition problem-check the pick up coil inside the distributor. The PCM receives this information to determine the timing of the spark.
My car was doing the same thing. It would stall out while idling or even turning a corner. I ended up replacing a few sensors but the problem was the fuel injector pressure regulator. The check engine light never came on. It was leaking fuel through the vacuum side of the diaphragm. Disconnect the vacuum hose from the pressure regulator and if there are any traces of gasoline it needs to be replaced.