4.3 engine when cold, smokes?

White smoke? Blue smoke? Black smoke? Did you install the donor's O2 sensors as well?

Fuel whilst burned produces water as by way of-made of combustion. When the exhaust manifold and pipe exhaust method is bloodless it condenses the vapor and as a consequence offers the white smoke. This is very similar to the jet marks over the skies on a bloodless day. Nothing mistaken there. However if the smoke is constant even if the engine is already sizzling, that's a crisis, that means you've leaky valves or jewelry. Go to a mechanic to get it constant earlier than it's too past due.

1 make sure wires are on correct plugs

2 check for vacuum leaks

3 if distributer was removed restick it,,could be off a toorh

4 most common oil burning caused by bad rings or valves [seals]..run compression test,,[gage about 40 dollars

5 gee..you could of had a V8

6 all sensors good?

I assUme oil correct weight..10 w 30 is default position

if it smokes and fouls plugs a lot that is tell tale sign that oil is getting into your cylinders. your piston rings could be dead.

if it just does it in the mornings then you probably have bad valve seals.