Rough idle

Humangaschamber

New member
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Buick Ownership
1980 regal
Good morning all! I have a 1980 regal 3.8l that suddenly is idling rough when in park. It doesn't stall when driving but in park if I let off the gas it's 50/50 it's stalls. I have checked and replaced hoses, changed air filter, pcv, and cleaned the carb. Also when I turn the heater on it idles much better and does not stall. Any insight and suggestions are greatly appreciated.
 

MelsRegal

Full Member
Staff member
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Buick Ownership
Regal GS 2017
Could be a vacuum leak related to a hose or other component related to the AC/Heating system. Try disconnecting and plugging the main vacuum line going into the passenger compartment.
 
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