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If the mass air sensor (MAS) is malfunctioning, it could be telling the control unit that a lot more air is entering the engine than the true amount of air. So more gas is distributed to the engine to match the mass air reading. When you unplug the PVC from the hose, you are introducing more air and are one step closer to equaling what the possibly malfunctioning MAS is telling the control unit. Connect all hoses and sensors. Disconnect the MAS. It will be that sensor, just after the air filter. This will put the MAS readings into fail-safe (general parameters) . If this MAS is reading incorrectly, the engine should be smooth when the MAS is unplugged. If this fixes your issue, there is special cleaner to spray and clean the sensor. It may not be bad. It may just have a coating on it (inside the air intake tube). I've seen a feather on the mass air sensor shut down an engine completely
The fuel system is probably gummed up from the gas sitting in the unit. Change the gas and use a fuel additive such as Star Tron in the new gas to help clean it out. If that doesn't get it, you may end up needing to replace the fuel filter and/or rebuild the carburetor. You can get the model # from your carburetor (usually stamped into the housing of the carburetor, itself) and enter it at PartsBuggy's website here to get a list of the available repair kits.
Ethanol in fuel shortens the shelf life of fuel dramatically and using Star Tron can all but eliminate the problems of ethanol in today's fuel.
Your only problem friend, is the temperature sending unit/sensor. Upon cold start, this sensor wil tell the computer to go into cold start mode putting a bit more fuel in and raising the idle a bit to keep it running when cold without using the throttle. Replace that sensor and your good to go. Makes sense, right?
Throttle position senser might be going bad. I had in the same problem in my truck. It wouldn't stay running unless I had my foot on the gas and as soon as I let off, it would die. Try it. The sensers are relatively cheap at Auto Zone or somewhere similar. Around 30 bucks.
Have these unit been stored with fuel in them or sitting around for a long period of time? If so the carbs may need to be overhauled. Also check for a clogged fuel filter and vacuum test the fuel lines for cracks.
Hi: Have run into same type of problem, turned out to be a dead or very battery. Has nothing to do with the ignitin switch. With a low battery have also had trouble getting the key out of a 95 Jimmy. Boost unit to get running then discommect battery, if unit stall right away replace alternator, if stays running replace battery. If you get the unit runnimg and try to drive it as is you should find lacks power and wants to stall.
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