Well, finally got the plugs, I ordered them from sparkplugs.com because I could not find them in town except at the dealer. Changed them out but no change (they are exactly what came out, Denso), still misses and stutters under acceleration and at cruise when warm . So... I've:
1) Replaced the intake manifold gaskets
2) Cleaned the EGR valve and tube/port
3) Cleaned and checked PCV Valve
4) Cleaned the MAF sensor
5) Changed spark plugs
6) Tapped (BEAT) on the fuel rail
7) Changed fuel filter
I've run out of ideas, if anyone has any suggestions please let me know, otherwise we'll have to take it into the shop on Monday.
Thanks for all your help,
Brett