LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Possible OPTI issue, please help guys.

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Old Jun 10, 2009 | 11:44 PM
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Default Possible OPTI issue, please help guys.

A little history, had a stock rebuild about 4k miles ago. After about 3k miles the car would miss and breakup under WOT, between 3500-5800 rpm where I get off the throttle. When it starts missing, I can get off the throttle then back on the throttle and the missing goes away. The OPTI was replaced with a new AC Delco unit (I think it was that brand) during the rebuild. I think the OPTI is the problem. Right now the water pump and timing cover is off and I am considering a new OPTI. Am i able to replace just the cap and rotor of the OPTI, or do I have to get a whole new one. Remember this unit only has about 4k miles. Any help is really appeciated guys.
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Old Jun 10, 2009 | 11:46 PM
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vented or unvented opti? If Vented u ever replace the vent harness? Or inspect the electrical harness (both vented and unvented)?
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Old Jun 11, 2009 | 12:00 AM
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My bad, it's vented. 96 Formula.
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Old Jun 11, 2009 | 12:04 AM
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I'll check the harnesses to see what they look like.
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Old Jun 11, 2009 | 12:06 PM
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What trouble shooting did you do to make you pinpoint the opti as the problem?

You can just replace the cap and rotor if you which. But I usually recommend replacing the whole unit for good measure.

What I would do is remove the opti and open it up and inspect it.
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