NGK Iridium IX problems

[Patton]

Hey,
I just bought 6 NGK iridiums for my '01 sport. I put one side in and noticed that it was too much trouble to put the other 3 in because the side they were on is just to crowded, so I decided to leave those 3 to my mechanc. I took it for a drive and it drove terrible. So I came back and removed 2. The 2nd I removed was badly damaged so I was under the impression I had fixed the problem. After all, one piston not firing would cause the engine to freak out. I replaced the 2 Iridiums I had taken out with 2 old platinums. I have 2 questions:
1. My X still shakes badly when going up hills at 45 mph and beyond (I did all this mess tonight, I've only driven it 15 miles since all this) Will having 5 old platinums and one new Iridium cause this kind of problem? What are the possible repurcussions of this?
2. Why do the NGK Iridium IX's come with a .059 gap when the SOHC calls for a .054 gap? The one NGK Iridium I have in my engine is still gapped at .059, could this cause any major problem, like the vibration I feel when going up hills?
Sorry for long thread. Thanks in advance for any help. Sorry if I've confused you

 

[Xpl0rer]

first off i would recomend staying with platinum plugs if you insist on the ngk, make sure they all are the same gapped within specs. have you done any routine mantinence? i.e. plug wires, fuel filter, tested fuel pressure..etc... i believe that .59 is within specs on your gen II, (i believe theres a range given) if i'm wrong be sure to gap them yourself. new plugs or not i'd check the gap reguardless.. and i definately wouldnt run with old and new plugs, might be just me but i just wouldnt do it. fyi... a stubby ratchet and plug socket works perfect for the #3 plug..

 

[ExplorerDMB]

the gap difference won't cause your issues. Did you mess up any wires while you were removing them? I usually recommend doing plugs and wires every 60K miles. What are the used platniums gapping at?

-Drew

 

[rmcknight]

i agree, gap wont case any issues, the new plugs are a little longer too, but again - that wont cause anything either. my guess is you broke one of your wires or crossed 2 of them up?