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 Bob,
 I had some fuel boiling going on and installed a 1/4" phenolic spacer - that's all I had room for.  Haven't seen it again since but I haven't driven on an extremely hot day.  So, I can say it has at least helped.  Also, I used to get some backfiring and "crackling" on decel and after installing the spacer, it hasn't done that at all.
 
 Kevin
 
				__________________"Anyone who drives faster than you is a maniac and anyone who drives slower than you is an idiot" - George Carlin
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