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I have a k5 with a 305 in it and it is a turd. The cucv has more torque for sure. Back to original question of thread did the owner ever figure out the problem? If fuel filter was changed, then most likely IP needs work like cucvrus mentioned initially. What about air cleaner? Is it fresh?

http://www.dieselhub.com/idi/6.2-gm.html See compression and hp sections in middle of article. The j code code motor had the code of LL4. Interestingly, it seems the compression was raised during production years but still lower than the c code. I learn something everyday! My m1008 is a 86, so...

I read on the stupid internet that the compression was higher. Who knows? The j code apparently had different heads than the c code. If the motor puts out around 165 hp like I stated before, or 155 hp, it is still 25 -35 more hp than a c code. Now whether the increase was due to more fuel at IP...

J code 6.2 is actually around 165 hp and around 285 ft/lb of torque. Civilian model, C code, is 125-135 hp. J code has higher compression and no emissions junk. Your problem sounds like a lack of fuel. Change fuel filter first. Cheap and relatively easy. Get a fuel additive. I am using...