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Q: after warm up it stalls have to use full throttle to start serges while driving on 1990 GMC S15 Jimmy

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it acts if it is flooding can this also be the fuel pump? I was thinking throttle position sensor but not sure. It wont idle after it warms up. hold throttle to floor to restart smell gas. The serging is at any speed including highway.
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