Not enough vacume
Probably a bad u-joint.
There are multiple things that could cause this, your best bet it to take it to a mechanic and let them check it out.
The 1998 Chevy Express 1500 Van could have the 4.3, 5.0 or the 5.7 engine.
It sure could. If you KNOW how to use it and READ it.
They could.
evo sensor, also known as steering speed sensor.
NO.
The EGR valve on a 1994 Chevy 1500 is located on the top of the engine. If the valve becomes stopped, the engine could idle rough or stall.
The 1998 Chevy Express 1500 Van could have the 4.3, 5.0 or the 5.7 engine.
NO.
One could buy a Chevy 1500 4x4 at one's local Chevrolet dealership. Chevrolet dealerships can be found from the Chevrolet official website. This involves inserting one's zip code.
1500