I have a 1999 gmc 1500 with a 5.3 engine engine smokes white eye burning fumes out exhaust ' using extreamly loads of gas po300 code 50000 miles new tune up oil has gas in it runs rough compression is good good spark
by 
Anonymous
ANSWERS: 3
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check the rings or it may be your valves may be burnt or stuck open
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The code is multiple cylinder misfire. It's obviously getting too much gas. Too much gas will cause misfires, but should be smoking "black". Too much gas with misfires will leak around piston rings and build up in the oil.
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usually white exhaust indicates coolant leaking into the combustion chamber. From what you have described, it sounds to me like you have a blown head gasket.
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