I have an 01 yukon it is comin up with codes p0452, p0131, p0151, p0430, p0307...it is misfiring it used to only start at a quarter of a tank of gas now its doing it at over a half...we have replaced fuel pump twice, done the coil it was comin up with, spark plugs, wires, etc... We had it into shop because it was starting really bad they cleaned injectors and it ran good for 3 days now it starts fine but misfiring and cutting out... I need some help PLZ!!!!

SOURCE: 1997 GMC K1500 4x4 5.7 ex.cab SFI injection system

Did you check the fuel filter?
or possably the catalitic converter is cloged, check the exhaust pressure.

SOURCE: 1997 GMC K1500 4x4 5.7 ex.cab SFI injection system

Hey there boatright33,

A few things things immediately come to mind.

There may be a problem with the engine controller. You could check the ODBII onboard diagnostics. Auto part stores will usually do this for you at no cost.

When you pulled the ones that were/went bad, how did the filters look? Could there be particulate matter still in the tank causing them to fail.

I always put this one off until last. Check the injectors. Are they gummed up?

Let me know what you find out
Mike

SOURCE: 1999 Yukon cold start problems.

1999 Yukon Start Issue - I have replaced the octopuse, battery, fuel filter, fuel pump, still having problems starting in cold weather, sometimes after a heavy rain.

Any suggestions?

Thanks

SOURCE: 97 jimmy wont start

Check for a bad distributor cap and or rotor..........a bad cap and or rotor can caues firing (cross fire)across the terminals and introduce spark to the wrong cylinders at the wrong time.......
hope this helps.....good luck!

SOURCE: check engine light 2004 GMC Yukon

When my check engine light went on, it was a oxygen sensor