Clean your throttle body with throttle body cleaner, inside and out, and check your idle air control valve on the throttle body. That can be taken off and cleaned too. Be careful with it, it has a small motor called a stepper motor. It's how the engine computer controls the idle speed. The only air passage into the engine at idle (when the foot is off the gas pedal and the throttle plate is closed), is this air passage under the idle air control motor. The stepper motor allows it to control the amount of air, less for lower idle speed, more air for higher idle. See? Well, good idling.
Here are the most common causes of idle surge, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
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I said the truck is a 1975 Doge Adventure 200 with a 350 engine --It has a carburetor!
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