Engine stalls when you pull number 5 spark plug wire.

moparlvr166 said

What did you find wrong with #5 plug?
What carb, jets, P/Valve, D/Pumper?
O2 sensor on each bank?
Have you tried smoke testing for Vac leak?
I always thought when testing by dropping a cylinder spark, the lower the RPM's drop too would mean the stronger the cylinder

Click to expand...

spark plug seems to have a lean mixture compared to the rest. Carb is a 750 holley double pumper with a proform mainbody. Powervalve 6.5. 02 sensor on one bank. Changed the collector too the other side and there is no problem there. The air fuel ratio stays more stable on the other side. Also changed the carb for another one....same story.

I can try the idea with smoke. The rpm drop on each cilinder is significant. But when i pull number 5 the engine sounds the same like dieseling.