No.
It should be on the front of the intake manifold directly above and behind the water pump.
Yes it will bolt right up to it.
The fuel lines around the filter; you will need an adapter.
The EGR valve on your Astrovan is on the backside of the intake manifold just under the throttle body attached by two bolts. After installing a new gasket be sure and torque the BOLTS to 17-18ft lbs or the NUTS (if yours has studs) to 15ft lbs)
.043
.43L. 1000ml=1L
Don't know what year you have but some sensors are temperature sensitive and you should run a 195 degree thermostat.
4L60/E l
43L of 18-k gold
remove the intake hose and the exhaust port screwed into the egr valve, the remove the two retaining bolts from the intake and clean any old gasket material away. if possible run a piece of wire down the hole to make certain the passage is clear of carbon build up
There is one before and one after the catalytic converter.
There is no adjustment required, but you can clean it with a carb cleaner.