how can i find what is wrong with my subara impreza?

some times my subaru impreza sports misfires and will not respond to throttle this can last for ten minutes then it clears.it happens every so often .any ideas?
chris at christophermcdaid@btinternet.com, February 2007


done
your fuel pump could be on its way out had a similar prob

jacko, October 2008
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