P0300 code, Random Misfire

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YUKON 808IN702

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i have a 2005 Yukon XL SLT 5.3 flex fuel, recently after a tune up i have been experiencing this , it was off and on kind of thing that was happening...one day running fine no codes , couple days later running horrible and engine light coming on or flashing.. on to the trouble shooting first there was a number 7 injector intake leak, i changed the o'rings and did all injector tests and fuel pressure test , vacuum test compression test, noid light, voltage test everything fine, so i sealed the outside of number 7 injector with high temp gasket seal, now the SUV runs fine now.....no codes SUV runs fine, just have replace the intake manifold and gaskets just because of leak at number 7...........one week later SUV stumbles at acceleration , so i double check spark plugs....and to my avail it was number 2 spark plug cracked, replaced the spark plug with an OE AC Delco platinum and now the SUV Purrs again..............

Happy Yukon Owner
Have a great ride everyone

Dino
Gonzales
 

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