Have you checked the compression on that cylinder? should be 150 psi. Could be the intake or head gasket on that one cylinder.

Answered by bob77
2 questions asked

I checked the spark plug and shows no signs of water burn or blister. There is no water in my oil or oil in my water. I will be compression and vacume checking it. Thanks. [quote] If at first you dont succeed keep sucking till you do succeed.[/quote]

Response from chevyguy
1 question asked

Hello: does that plug look any cleaner than the others, does it look any different at all than the others. You may have a vacuum leak at the intake runner or something causing a slightly lean burn in that cylinder. Possibly run water all around the intake manifold and stuff to see if the engine stumbles or anything. See if the plug has a dark spot on the intake side of the porcelin tip, possibly sucking a little oil and air in from the lifter valley
good luck
Darryl...

Answered by DARRYL
2 questions asked