1998 Chevy Astro Check Engine Soon

1998 CHEVROLET ASTRO
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JMG
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1998 Chevy Astro 91000 miles
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I have an problem with my 98 Astro - check engine soon light keeps going on. Car has been to mechanic for full tune up and code cleared for a day or two, but keeps returning and is intermittent. Any ideas ?

The only error code is P0304 - "Detected Engine Miss Fiire Cylinder 4"
Dec 31, 2007 at 7:13 PM
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RASMATAZ
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You need to get it rescanned and comeback with the code/s in order for us to help.
Jan 1, 2008 at 6:26 AM
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JMG
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The only error code is P0304 - "Detected Engine Miss Fiire Cylinder 4"

Car had full tune up - less than a month ago when the problem first started.
Jan 3, 2008 at 5:41 AM
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RASMATAZ
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Check the sparkplug, compression and injector on that cylinder.
Jan 3, 2008 at 11:01 AM