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Old 10-03-2011, 01:25 PM   #1
sjreno
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'00 5.3L with multiple misfires. Not sure why

My truck ran flawless until I had her parked for 9 mo. Then when I started her up, there were multiple misfires. Changed out plugs, wires, fuel filter, air filter, and NOTHING. Runs good under load though. Intake mani gasket?? Vac lines im not aware of?? Thanks for your help.
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Old 10-04-2011, 04:02 PM   #2
biggsteve97
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Re: '00 5.3L with multiple misfires. Not sure why

could be bad fuel. 9 months is a long time to sit especially without putting in some kind of fuel stabilizer.
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Old 10-04-2011, 09:42 PM   #3
usmcchevy
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Re: '00 5.3L with multiple misfires. Not sure why

Quote:
Originally Posted by biggsteve97 View Post
could be bad fuel. 9 months is a long time to sit especially without putting in some kind of fuel stabilizer.
I'd have to agree. Depending on how bad I would ether drain the tank and put in fresh fuel or dump in an entire quart of Lucas fuel system cleaner and top off with fresh fuel.
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