Need to check fuel pressure with a gauge
Check the exhaust converter, and exhaust and make sure its not
restricked. Engine vaccume should be 18-21 inches of vaccume.
check it with a gauge. need to know what year it is.
Hepa vasuum cleaners have a filter that removes particles from the air that is dicharged by the machine. This filter needs to be replaced unless it is washable.
Most vacums need to be replaced every 20-30 uses.
Either your filter needs to be cleaned or replaced.
could be a vacuum leak
Vacuum lines on the 2003 Chevy Silverado 2500 heavy duty pickup truck. A diagram of the entire vacuum line system can be obtained from most Chevrolet dealerships.
The vacuum lines on a 2000 Chevy Silverado run between the intake manifold and multiple valves across the top of the engine. The vacuum pressure is generated by the engine's compression.
Check all vacuum lines
Perhaps you have used the wrong sand or it is still blowing old sand out of the pipes.
The transistor replaced the vacuum tube, allowing radios to get much smaller and portable.
A diagram of the vacuum lines on a 2006 Chevy Silverado can be find in the service manual. It outlines their location and specific function within the vehicle.
You can find a vacuum diagram for a 1988 Silverado with a 5.7 engine at your local auto parts store. You can also find one at most major book stores in a Silverado repair book.
Most likely the filter. i would check the fingers inside the filter for tears.