'00 5.3L with multiple misfires. Not sure why - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sjreno · 10-03-2011, 01:25 PM

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.

biggsteve97 · 10-04-2011, 04:02 PM

could be bad fuel. 9 months is a long time to sit especially without putting in some kind of fuel stabilizer.

usmcchevy · 10-04-2011, 09:42 PM

Quote:

Originally Posted by biggsteve97

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.

10-03-2011, 01:25 PM	#1
sjreno Registered User Join Date: Aug 2009 Location: central jersey Posts: 55	'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.

10-04-2011, 04:02 PM	#2
biggsteve97 Registered User Join Date: Jan 2010 Location: Kansas City, Mo Posts: 284	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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