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carb issues
If it cuts out at idle or when your foot is off the gas pedal, its the Idle Air Control sensor.
Need to know year and engine size, That will help us answer your question. it's a 7.4 454 engine in a 1996 GMC suburban
That requires a special PULLER to remove the pulley.
it only studders at low rpm it runs great at high rpm or accelerating only at idle and take off rpm
The #1 problem with these vehicles is a weak fuel pump; yours may be starting to fail. Have it tested.
The A/C idle compensator solenoid is not functioning. This should be located next to the carb.
It screws in from the rear. TAke the light assy off.
take the water outlet off the top of the engine and the thermostat should be right there
A failing fuel pump could do that.
You might need to check the spark plug wires, fuel filter, and check the vacuum hoses.