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the day i bought my 1999 gt I of course "tried her out". Afterwards she started missing in 4 - 5 th gear once I put the gas to it. I ran an Comp. check, and it said I had a misfire in CYL.#6. So, I replaced the plug, and it drove fine. Now, weeks later it does it again, but not nearly as bad; and only when in higher gears, with a load on the motor. Any Suggestions??
 

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How many miles on it? It could be a spark problem, pull the plugs and see what they look like. The cop's may need to be changed out, after 80-100k miles they are about done. Replacing with oem's are fine, they are pretty good parts, and msd and granatelli make good ones too, but they won't give much benefit until you start making serious power.
 
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