problems with the speedometer jumping when going from park to drive? I noticed mine does it every now and then.
Also does anyone get a few random misfires if you hold 2nd at about 4k rpm or in any gear at any held high rpm? I used to get them all the time with the stock plugs, then i changed to ngk tr55's and get misfires less but everynow and then i still notice it. No check engine light either.

 

Sounds like a possible cluster problem. I don't think the plugs are related to the speedo jumping. I would recommend AC Delco plugs.

 

Check your plug wires and make sure non are loose. No problems with my NGK's Did you gap them?

I'd also check your grounds. Make sure nothing came loose.