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· Premium Member
1,004 Posts
I have a couple of questions because I have seen this before.

Does the engine pull 18 to 22 inches of vacuum? If not fix this problem. Adjust for altitude if necessary.

Does the engine stumble when it is under a load but idles great? If yes check the coil, coil pack and or ignition cables.

Rationale when the engine is idling it is not under a load condition and requires very little spark to keep it running. When the engine is under a load condition it requires greater spark for power, but if the coil can not generate enough spark for the added air/fuel mixture the engine will stumble.

Let me know what you think.

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