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

low rpm miss under load

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Old Oct 25, 2018 | 12:10 PM
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Default low rpm miss under load

Hey guys. A few months ago I had a problem where the car wouldn't start and found it was due to a bad coil wire. Replaced that and all was well. Now I'm experiencing what feels like a miss at lower rpms (under 2000) when I give it maybe more than half throttle. As long as I don't push down the gas too hard it runs perfect. I replaced the plugs when I was trying to track down the other problem a month or so ago (NGK) and I replaced the rest of the plug wires yesterday with no change. Coil ohm'd good, fuel pressure good, recently replaced fuel filter. Car runs completely normal otherwise. Any ideas?
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Old Oct 25, 2018 | 12:46 PM
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since you replaced the plugs/wires....REALLY check that you don't have arc at plug boot, or Opti, end. This can be hard to see so you will need to look from underneath in a darker environment with engine running. If you use the stock metal heat shields over the plug boot end the arc can be between the boot and shield making it almost impossible to see.

misfire under load is often due to plug arc.
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Old Oct 28, 2018 | 07:05 PM
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Found a cracked plug on cyl 3... how the heck did that happen
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Old Oct 29, 2018 | 10:19 AM
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From: Jackstandican
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Originally Posted by SilverSS07
Found a cracked plug on cyl 3... how the heck did that happen
Tightening it at an angle. I've done it a few times. NBD.
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