Removing the manifold isn't that difficult. Maybe a half hour if you know what you're doing.
I'm having the same problem with a 2000 'tec. New plugs and still missing.
Try switching the wires between the #1 and #4 cylinder. Make sure you switch it at both ends. If the miss moves, then you know it's the wires. If not, it's either a bad plug or coil.
2004 Volvo S60 2.4
1999 Toyota Camry - Totalled 9/18/14
1997 Lincoln Mark VIII LSC 4.6L DOHC - Retired 4/20/14
1995 Mercury Cougar XR7 4.6L SOHC - Lazer ***** Retired 4-27-11
1990 Mercury Sable GS 3.0L - The Peeling Paint - Retired 6-4-04