Listed in your owner's manual and under the hood on a placard.
delco or bosch plats
.035
Standard gap is .060" or 1/16".Ask at auto parts counter when purchasing spark plugs.
Could be,Firing order is messed up.Ignition module is bad.Bad spark plug wires.Bad spark plugs.
( .040 inch ) according to my Chilton repair manual for the 350 - 2 barrel
The recommended spark plug gap is .045"
with a spark plug sockett
I had the same Problem on my 94... try replacing the spark plug wires.
It is under the hood at the right rear of the engine compartment at the antenae.
On the 3.3 Liter V6 it is .060.
The recommended spark plug gap for a 1979 Olds 4.9L is .060"
Platinum's