My car idles as smooth as ever and every once and awhile the tach will get a mind of its own and jump from 500 to redline to 2000 and haphazordly jump around for an totally none consitant amount of time. Seems to make it better when I disconect the batery and tach wire and reconnect it with the car off. The car never did it until the last time i took the intake manifold off and "though" I set the timming back right. Any ideas?

 

oh ya, might help if I tell ya the car, here is the signature.

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She is not the fastest thing in a straight line but she sure will stick in the turns.
Hawian Orchid X-SCCA showroom stock racer 1LE 92 Z-28

-suspension parts include koni reds, eibach racing springs, weight-jacks, relocated control arms, and the list goes on for suspension; Port & polished TPI system sitting on top a fully blueprinted, balanced and matched race built 305; centerforce II clutch; custom 3.4 auburn rear, custom dual cat exhuast with hooker aerochamber muffler; 1LE fuel pump and gas tank; SS track baer braking system; griffin aluminum radiator; 6 point bolted roll cage with 5 point harnesses; pioneer speaker system; sparco seats, just about as light as you can get a weekly driven 3rdgen.

 

UVA,

Check the routing of the ignition primary wiring to make sure it is not in close proximity to the coil wire or plug wires. There was a TSB from GM regarding erratic tach readings, and that was one of their suggestions.

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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0

 

Just curious Vader, is there anything else you do not know?