[quote name='ivansc' timestamp='1321304130' post='1437637']
Beginning to wish I hadn`t asked - so embarrassed.
[/quote]
Shouldn't be embarrassed at all. It could be a number of factors:
Dead Strings
Pickup Height
Uneven String Height (Bridge)
And something which hasn't been mentioned yet, EQ. You may have an issue if you have the tone all the way down. I have never used my precision except for Vol/Tone both on Full.
Your playing technique may be a contributing factor but a simple test would to play one string open then mute it. Followed by the next string at the same strength and mute. Wash, Rinse and repeat. If they don't sound even it is VERY unlikely to be down to you.
Finally, if you can't get an even sound out of it take it to a luthier before splashing out on pickups.
Don't ever be embarrassed for asking a question though