C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Running issue

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Old Apr 4, 2022 | 06:24 PM
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Default Running issue

Hi all,

I have been having some rough idle and running issue so I was checking my timing, I unplugged the cable by the bulkhead to do the timing check. This smoothed everything out. The car ran fine.

89 TPI.

Any ideas on why would this happen?

Last edited by Jez28; Apr 5, 2022 at 03:55 AM.
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Old Apr 5, 2022 | 02:11 AM
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year?
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Old Apr 5, 2022 | 03:57 AM
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That would help. 😁

89 TPI.

Thanks.
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Old Apr 5, 2022 | 09:28 AM
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i believe i would start with icm. ignition control module. another possibility being pickup coil down in the shafr of the distributor.

a new distributor would be pricey but would be complete i think

even a used corvette hei would be good

see what others say too
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Old Apr 5, 2022 | 12:06 PM
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ignition control module
When you unplug the bypass you disconnect the ICM
That should be your issue.
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