Stumble at idle

[Codey]

For some reason when my trucks ideling it drops slightly in rpm every once in a enough for me to notice by ear then it comes back up. what could be causing this to happen

 

[89Suburban]

It gives the truck character.

Check all your spark plugs, cap, rotor, carb adjustments.

 

[Codey]

I changed out the spark plugs and it helped it still a small stumble but it is very minor if it wasn't my truck i wouldn't notice it.

 

[89Suburban]

What about under your distributor cap, did you take a peek at the terminals under there to see if there was any buildup on them?


Posted From Hell

 

[MrMarty51]

Also, while You are under that distributor cap, look closely for the black carbon tracking. Black distributor, it is a tough one to see but it will cause cross firing between cylinders.
Thas all..