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Fuel-related problem: Your Yukon could have run out of fuel, or there may be an issue with the fuel pump, fuel filter, or fuel injectors. Insufficient fuel supply can cause the engine to stall.
98 so its a older vehicle ?? Well i know nothing about layout of this american vehicle but for its age check the fuel rail as on the end is a vacumn controlled valve so make sure its connected and the vacumn pipe isnt cracked or perished ,Anything else i have no idea sorry dont see these motors here in spain very often unless its on a imported camper van but these are normally all diesel ,have seen a 7.2 litre ford E350 petrol though but running on a gas conversion
Climb under the Yukon with the drain pan, box wrench set and new fuel filter. Follow the fuel lines away from the gas tank until you locate the fuel filter, along the frame rail about halfway to the engine. good-day!
COULD BE DIRTY FUEL INJECTORS LEAKING WHILE ENGINE OFF FLOODING OUT SPARK PLUGS.TRY THIS REPLACE AIR FILTER.CLEAN FUEL INJECTORS BY ADDING A BOTTLE OF SEAFOAM TO 3/4 TO FULL TANK OF GAS SEE WHAT HAPPENS.
What size engine ? 4.3 L vortex P0300 random misfire code is usually associated with vacuum leaks , but could also be low fuel pressure , plugged fuel filter , fuel pump problem , clogged injectors etc... doing fuel pressure an flow testing would confirm or eliminate that as a problem . Fuel injector balance testing would confirm or eliminate clogged injectors .
It is possible that your car has some blocked jets, the fuel pump/injectors need a retune. Change the fuel filter and do a general suzuki 20 check up. the fault will clear off. I am sure this is a fault linked to the firing/fuel at the low RPM. What you can check is to see the filters, the electric section for poor contacts. Hope you try. Good day
You need to relieve the fuel pressure, Gain access to the fuel rail, should be 4 or 5 bolts holding the fuel rail on... once you accessed and removed the fasteners, carefully pull up on the railon aboth sides.. a little wd may help release the injector seals, and you definitely wanna replace the lower o-rings... be careful liining the injectors up when u install the rail
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