White smoke and dies on acceleration. Advice?

[brettinator]

Hey all,
I've been fixing up a 1988 Chevy c1500, 5.0L V8 sbc. The truck sat for many years on a farm, but is in relatively good shape.
I've replaced a whole mess of things including: alternator, battery, starter motor, radiator, plugs and wires, distributor cap, exhaust from headers to tailpipe, fuel filter, fuel pump, brakes, drum to disc conversion, brake master cylinder, and other non-mechanical things. New oil, trans fluid, coolant, etc. I once changed the throttle body to a holley but switched back. All else relevant is original as far as I know. Previous owner was family.

My problem is: I have a lot of white smoke coming out of the exhaust and maybe some condensation. When I drive, the truck is fine accelerating slowly, but when I push the accelerator past maybe 1/3, the truck immediately dies. I can slowly accelerate up to about 40 just fine. At any speed, if I push past say 1/3 ish, it dies out. I let off and it is fine again.

Any advice is appreciated. Thank you

 

[DerekTheGreat]

You mentioned throttle body, so I'm assuming we're talking about a stock truck with T.B.I. You'll want to get a scan tool so you can look at the data stream. You're also going to want to check fuel pressure as well as whatever test there is to determine if you've got a blown head gasket(s). White smoke is indicative of water in the combustion chambers. Verifying base timing as well as the condition of ignition components like plugs, wires cap & rotor would be a good idea too.