6.2 problems
 

I have a 6.2 in a 85 chevy k30 that is not running right when it warms up it has no power on top end and acts like it's not getting enough fuel and a lot of blue smoke
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Re: 6.2 problems
 

Make sure your fuel filter is not clogged.

I put a new filter and fuel pump on it
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Re: 6.2 problems
 

There are a number of things that can cause that. Have you checked pump timing?

Re: 6.2 problems
 

Watch this YouTube video, I believe he had the same issues you are having w/ the 6.2 its either this one or the next.

https://www.youtube.com/watch?v=TSU2lvRWeYw

The truck is running it's just has no power when you give it a lot of fuel it dies and then it doesn't even want to idle right but if you shut it off it will crank back and idle fine until you give it a lot of fuel again
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Now it will idle fine and have power then all at once it has almost no pedal and when you take your foot of the pedal it shuts off and then will crank right back up and idle good again until you give it a lot of fuel
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Re: 6.2 problems
 

You may have an injection pump going out.

Would it be acting like that going from good to bad back and forth
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Re: 6.2 problems
 

Pick up sock in fuel tank could be clogged. Especially if truck had been sitting for a while.