Power loss and idle shaking in 4.3 chevy blazer?

I have a 2000 chevy blazer with the 4.3 engine. It has a small shaking at idle and has been losing power. I ve replaced the distributor cap, intake manifold gaskets. And it still losing power and shaking . I don t know what it could be but please help

Other answer:

Richard:
Could be a lot of things. Clean the mass air flow sensor.Most things will trhrow a code. Get them checked out also.
DR + Mrs Bears face:
Hi Age and mileage has taken away the power it once had this is why we buy new cars.
thebax2006:
You may have a plugged up catalytic converter.
Sierra:
Could be your spark plugs and wires or your fuel injectors.

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