1999 silverado wont idle when cold

[Bubba14]

I am taking mine to the chevy service department this afternoon.
I sprayed a little starting fluid on the intake manifold gasket seam and the engine smoothed right out.
I should have listened to 99ssconv back in Dec.
Well I did sort of, I sprayed carb cleaner but it was the non flamable type so it didn't make any difference in rpm's, but the starting fluid showed up real quick.

[Bubba14]

It's fixed! Got the intake manifold gasket changed and engine runs fine even when cold. Misfires gone, rpm surging gone, Thanks for your help. Bubba14