I have a 03 Silverado 6.6 duramax, 300,000 miles, truck runs clean, normally no smoke at all, but a few occasions , very random, it will blow white/gray smoke, enough to stop traffic, total flume, power drops to nothing, the 3 times it happened, its was on the verge of a stall, then just as sudden, power picks up, runs good, and after a few minutes, smoke is all cleared. its way to much smoke for a injector to get stuck open,...any ideas?

 

sounds like an injector issue. does the smoke smell like raw fuel?

 

to tell the truth, I was unable to smell the smoke, kept driving and hay fever didn't help, but it did not seem dark enough to be engine oil, one thing I left out, I drove for about 3 or 4 miles after I got power back, and I noticed a trail of fluid that I left, I did not turn truck off and went to next stop a mile away and the trail was still there, this time I turned truck off, the driver side is wet from a power steering leak, and that is the only wetness I saw, top of engines was dry, fuel lines looked dry and after restart an hr latter, everything was normal, like I said, smoke was almost white, was in no way antifreeze

 

white is related to raw un atomized fuel typically from a bad injector, or coolant.

 

fuel control actuator? fragged injector?