Camshaft position is taken from the distributor, there is no separate sensor.
The crank position sensor On your astro is located on front of the engine on timing cover, left side. Behind the crankshaft pulley. with a connector of 3 wires.
its right behind the harmonicbalancer
front of the engine under the crankshaft pulley
The Astro does not have a flywheel, it has a flexplate. To remove it you have to remove the transmission so you can unbolt it from the crankshaft.
Attached to the side of the throttle body.
either cam shaft sensor or crankshaft sensor or air flow meter are the common 3 things
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The TPS Sensor is located on the pass side of the throtle body the electric plug, plugs into the top of it and it has to small torx screws holding it on