I'd agree with that bet. Backfiring is a sign of a lean mixture, which points to fuel starvation, which can mean plugged fuel filter, a singing fuel pump, cramps, and a headache. 

Chris.

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Dnia Jan 23, 2012 o godz. 21:15 T Collins <tonycollin@GMAIL.COM> napisał(a):

> I'll go with crap in the tank for 500 Alex!....You ran it to low on gas and
> know the pump is also making sounds?
> 
> It happened to me....
> 
> Good luck,
> Tony
> 
> On Mon, Jan 23, 2012 at 2:16 PM, jon durham <jon_durham@knology.net> wrote:
> 
>> My 85 Vanagon easily starts. But after going about a half mile, the
>> engine begins to barely run, sometimes back firing, This goes on for
>> about 3 minutes but then goes away. Sometimes if I stop the engine and
>> then restart it, the symptoms go away as well.
>> --
>> "Until one has loved an animal, a part of one's soul remains
>> unawakened." Anatole France
>>