I have an 1995 S10 Blazer 4x4 4.3L. When I first start the car in the morning it will idle then it will drop out and almost die then pop back to normal idle on it's own? It will go up and down a few times. It only does it when it's cold in the morning. After it warms up okay? I've replaced the spark plugs and looked for air leaks, could not find any.

Thanks

when was the cpi nut kit changed?

I'm sorry I do not know what the CPI nut is?

its the regulator knowen as the nut kit at any shop or parts store, its concidered major work and you would know if its been done seince youve had it