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Had the carbs decently tuned and the past 3-4 drives have been easy peasy.

Was pulling out of a car quest and engine fluttered a bit and died. It started immediately after the incident and all was good- tank was full of gas, as I filed up that morning.

A mile or two later at a light, my idle no longer would hold- dropped and would have stalled unless I feathered in the throttle. 

A minute later after holding the idle via throttle around  1k, the engine began to climb and revved high and held. I almost turned the ignition off in  panic because I thought revs wouldn't stop climbing and at that point I was not on the throttle at all.

I feel my engine is possessed. 

Car still won't idle properly now even though it idled all morning fine. I didn't see anything come loose or no noticeable change in power.

Any ideas what would cause the engine to suddenly freak out?

1905cc dual Weber 44

 

 

 

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DUBTUB posted:

... the engine began to climb and revved high and held. I almost turned the ignition off in  panic because I thought revs wouldn't stop climbing and at that point I was not on the throttle at all...

 

Up until you said that, it sounded like classic dirty idle jets.

But I don't think dirty idle jets would make it rev way high by itself. That sounds like possibly some issue with a sticking carb linkage - which might (emphasis on MIGHT) explain both rough idle and intermittent high revving.

Free advice here - worth what you're paying for it.

 

Looping (high and low revs) is frequently caused by an air leak in the intake manifold.  Did you remove the carbs when you or someone else tuned them?  We all know the old adage: when a new problem arises, look at the last repair.  Could be that there was nothing wrong with the carbs, just the manifold, which would give symptoms of a plugged jet.  Of course, internet diagnoses are always iffy.  Best of luck and please let others know how you fixed it.

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