Car idles fine but when in gear stalls

1978 CHEVROLET MONTE CARLO
170,000 MILES • 5.0L • V8 • 2WD • AUTOMATIC
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ABRODIN89
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My car idles car in park and when shifted into gear. I live on an incline so when I have to give more gas to get up the hill it stalls. I have replaced the head gasket, the heads, distributed, carburetor and fuel pump. What could be causing it to stall when the gas is pressed?

Also when being pushed by hand in reverse and slight gas it is able to climb the hill.

Anything helps.
Mar 6, 2020 at 7:51 AM
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94 TRANSAM
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Oh boy this could be 20 things. Can you give some more info? Did this start out of nowhere? Has it been doing it for a while and has gotten worse? Please let me know.

It would also help if you could get in the car, start it with the hood open and have someone shoot a video of it stalling when you put it in gear so I can hear the motor.

Thanks, Rich
Mar 6, 2020 at 5:32 PM