Loud knock & Low RPM no power

Elephantman

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Joined
May 29, 2016
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Raleigh/nc
Need help. 2005 3500 6.6. Started truck up and heard loud knocking and could only get around 900 rpms. Was fine when I parked it last night. So I changed fuel filter because I had been putting it off.
Added 10 gallons of fuel because it was almost empty. Still have the knocking but now I can rev to 2000 rpm. Added Sea Foam and drained the fuel filter. Didn't help. If I put it in drive it will only get 1000 rpm and the slightest and I mean slightest upgrade in my yard causes it to stop. No power. Only on level or down hill can I move.
Being a pressure washer you can imagine this is my busiest time of year. No mechanics available because of holiday. Please help. Thanks in advance.
 
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