Iv got a issue with my 05 Chevy Silverado 2500. It’s got the 6.0. It will run fine for a few minutes then all of a sudden it starts cutting out, loses all power, and acts like it wants to stall. Iv changed the exhaust manifold because there was a crack and I thought maybe that would cause power loss.
I put new plugs and wires. I also put a new mass airflow sensor. Nothing seems to help and I am at a loss on what it could be.
ANSWER: If the check engine light is on, the first thing you need to do is check for any stored trouble codes. You probably have P0300 misfire codes. That could be caused by sticking fuel injectors, low fuel pressure or an ignition problem. If the engine light is flashing, that means the misfire is bad enough to cause catalytic converter damage.
If not, then you will need to get a fuel pressure gauge and check the fuel pressure when the engine is starting to lose power. If the pressure is too low, the fuel pump may be going out. Normal pressure is about 60 PSI.
If the problem only happens when accelerating, you could have a plugged catalytic converter. These will usually give an oxygen sensor code or catalytic efficiency code.
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