1996 Ford Taurus Missing??

I'm working on my girlfriends car. it's a 3.0L 24v V6. It feels like the car's missing severly spark wise, so today i changed 4 of the 6 plugs. The reason being is because i spent 2 hours trying to get the intake manifold off.. I removed the 6 8mm bolts on top and the 2 7mm bolts behind it, but it seems to still be bolted down or caught on something near the throttle body. I tried everything to change the last 2 plugs under the manifold but i can't seem to get to them without removing the manifold. Any suggestions?