Go and buy a good manual for your year and model truck. Sometimes, there is a vacuum diagram under your hood on a sticker
When you accelerate it probably does not quit blowing but rather blows out the defroster vent. This would indicate a vacumn leak or possibly a bad vacumn check valve. The check valve is located in the vacumn line that goes through the firewall somewhere between the firewall and where it connects to the engine. Check the vacumn with a vacumn guage (pump) in line going into the dash for vacumn leak. Hope this helps. Keith
Eureka and Dirt Devil have the highest customer ratings.
Terribly as they suck
check vacumn tube lines for cracks or disconnections...bank of vacumn lines are back of engine, right side, by computer modules.
vacumn?
He filled a vacumn created by the French Revolution.
That engine does not have a vacuum advance.
you have a vacumn leak.
Temperature, humidity, lighting, vacumn seal, altitude
Usually, but not always.
Vacumn cleaner