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They usually wont idle thats normal, dont read the plug unless you are driving it hard and then chop the engine(let it die and coast in after driving it hard).
If you gas it and it blogs before cleaning itself out and taking off its to rich
If you gas it and it hesitates before taking off its to lean
If you rpms are down at the end of the str8 your to fat
If you stick it at the end of the str8 your to lean ;-)
Follow Daves advice and you will be in the ballpark and having fun in no time