1996 GMC C2500 excessive fuel smell out the exsust

1996 GMC C2500
175,000 MILES • V8 • 2WD • AUTOMATIC
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SJESSIP
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my 96 truck shows a check engien light,idols and runs ruff the code I am getting is p0300 witch states multiple cylender misfire. need to know posible cause?
May 28, 2009 at 4:58 PM
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RASMATAZ
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P0300 Random Misfires-normally indicates vacuum leaks and bad fuel.

Misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
May 28, 2009 at 5:01 PM