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My rpm gauge flutters, jumps thousands of rpms at a time. Can't figure out where to start
 

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BATSLOMAN GIVES NO FUCKS.
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Sloppy Jalopy
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'91 CRX DX, D15B (D15Z7), DX L3
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Maybe a dumb question but what is icm?
And nobody actually gave him a straight answer? Oh wait talon did.
Ignition Control Module, aka ignitor unit. It's the part in the distributor that controls power to the high voltage ignition coil. It takes a low power control signal from the ECU and turns it into an off/on pulse that fires the ignition coil, and in the process puts out a separate pulse signal that the tach uses.
It's about the size of a pack of matches and is screwed to the inside of the distributor. Slo posted a pic of one.
 
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