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2003 Chevrolet Suburban 1500 LS 5.3L Misfire
Posted to GM Engine on 9/3/2025 21 Replies

Installed a reman engine and at idle has a misfire on cylinders 1-4-5-8, installed new plugs, injectors, crank sensor, cleaned maf, all new gaskets, misfires at idle to about 1200 rpm then goes away, swapped coils and wires no change, fuel trims read -9 on...

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car Vehicle Data

2003 Chevrolet Suburban 1500 LS

VIN 3GNFK16Z83
Engine5.3 L / 8 cyl / FLEX
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
AffectedMisfire
Conditions1-4-5-8 Misfire
Open Help Request

car Vehicle Data

2003 Chevrolet Suburban 1500 LS

VIN 3GNFK16Z83
Engine5.3 L / 8 cyl / FLEX
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
AffectedMisfire
Conditions1-4-5-8 Misfire