Try changing the distributor cap and rotor to AC Delco brand and report back. Aftermarkets tend to short out with this motor for what ever reason.
Here's a link to your code P0306. P0306 Cylinder 6 Misfire Detected
SOURCE: I have a 2001 blazer that is throwing a P0306 code
the only reason it stoped missfiring when idleing was cause your moter was running off the extra boost of the carb cleaner try replacing the plugs and wires before doing that again boss. and you can fid out if its a hard miss by power braking put it in drive and keep your foot on the brake then increase the gas till the car tire just starts to slip if it misses really bad u have a hard miss caused by a coil pack or really worn spark plug or bad plug wire.
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