Rough idle 95 astro van, I did a full tune up , plugs,wires,cap, rotor,air filter,and fuel filter and cleaned egr vavle.

Clean the Throttle Body and MAF. Common fix for rough idle.

https://www.google.com/search?q=2002+chevy+astro+clean+throttle+body

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Check fuel pressure and fuel delivery. MAP sensor also needs to be checked.

Check the idle air control on the throttle body it is on when the engine is first started stays on until the engine is warmed up.

did you change the fuel filter? make sure all plug wires are on the right plug If the coil wire was crapped out the other wires may me too. look at the inside of the cap srpray some wd 40 in it and wipe it out good make sure top of rotor is clean too

http://groups.yahoo.com/group/villagerquest/

clean MAF sensor heated wires with spray carb cleaner first

time to buy a new van.. umm what about the alternator?

Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps

Check or replace the EGR

No,the oil ratings 10w30 and so refer to how the oil viscosity reacts to hot and cold.As far as running rough,when was the last time is was tuned up,cap and rotor if applicable,spark plugs and air filter?Is it carburated or EFI?

Try cleaning the trotle body at the butterfly,they tend to carbon up and not let proper air mixture at idle,tailtail sign some times is feels like the throtle pedal sticks or pops when depressing it.

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