Question about 1984 Pontiac Bonneville
There are several things that can cause this, from a split vacuum line to a broken hose or defective EGR valve to a defective timing advance diaphragm in your distributor.. You definitely have an over abundance of air in your engine and the repair could be cheap or expensive. I think first I'd inspect the motor, looking closely over the intake system for a missing vacuum cap / hose, broken hose, or fallen off hose. If nothing found, get a couple cans of carb cleaner and carefully and methodically spray down the intake, along all vacuum lines in a 1 second burst. Listen closely for an increase of RPMs - if the engine races stop and closely look where you just sprayed because you've just found the vacuum leak. Repair that leak and continue on until you've covered the entire intake / vacuum system - don't forget to check the lines going to the various canisters and components under the hood.
Hope this helps!
Posted on Nov 10, 2010
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Posted on Jan 02, 2017
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