My van shakes when i'm driving and its worst when i'm at the stop sign

The pump can be running but not pumping any fuel.
When it stops running you will need to figure out if you are loosing spark to the plugs or fuel to the injectors.

not 100% on your details but if your saying you can fill it in your steering wheel while stop with your foot on the break. check your power steering pump.

A shop didnt find anything? You have a suspension problem Lets start at the tires is there any mud or crude that affect the balance of your tire? What about wheel bearing is there side to side movement even with the rear,How about the upper ball joint and lower ball joint . a warp drive axle can cause this . If you are certain of there inspection with the suspension the problem is the torque convertor. If that stays lock up whoa you will be shaking like big time

Get the car to a garage somehow and do the diagnostics test, a shaking engine means something went wrong with the fuel system at least and at worst would be the timing on it but only computer will tell you what is really wrong.

sounds like a CV joint that may be failing. When the trans in neutral is disengages the joint and that stops the vibration. Have it checked out at a local shop.

have the struts checked

you either have bad brake pads or the bolts are loose that hold the front steering suspension on.

warped rotor. after you change them the car will stop shaking,

i would try to replace the maf sensor first because ive seen that a few times on ford and mazda vehicles (same vehicles really with different names) and also clean the throttle plate at time u change the maf.

not a big problem. It may be tie rod wearing. If you hear a click when turning it would be the ball joints. If it does not make clicking sound, then most likely tie rod ends or improper alignment