jcscoops

The misfire count and history shows it is cylinder 1. All other cylinders are zero. I am curious to know more about this ballance test

175 psi. When I did leakdown at 100psi the pressure in cylinder was 97 psi.

I have a 2015 Sierra with 4.3l V6 (LV3). I have a misfire on cylinder 1 (which is not a AFM cylinder). Shakes truck bad at idle but misfire will go away when rpm is over 1200. I have changed or checked the following: Coils (replaced) Spark Plug (replaced) Spark Plug wires (replaced) Injectors (replaced) Valve springs Rocker arm Intake and Exhaust Manifold Gasket 02 sensor MAF sensor Compression Test Leakdown Test The compression and leak down test numbers were temendous. The only thing that abnormal on the scan tool is that the long term fuel trim is high negative number I am running out of ideas so looking for any ideas!