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For spark plug gap, you will only notice a miss up in the RPM range if you are blowing the spark out with too large of a gap.
Appears your issues are around idle. Any other symptoms like a high RPM miss?
If it is not missing at high RPM then your gap is fine, fuel is fine, and most likely your plug temp range is fine.
Idle misses are caused by:
1. Tune
2. Vacuum leak
3. Bent valve or mis-adjusted rockers not allowing the valve to seat properly.
Is the car hard to start after being driven for a period of time?
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