Correct ignition timing should be at 10 degrees btdc at idle ( 850 rpms )
use a timing light connected to no 1 piston ht lead to set the timingby adjusting the distributor to get the light to flash on the timing mark
the vacuum hose is probably to increase idle speed when then ac is on and the surginging indicates a leak in a diaphragm
SOURCE: 76 volvo 240 car idles and low speed is rough,
It could be the filter. Has the fuel been changed after storage? I would also thing the Carburetor or the fuel injectors might need to be cleaned.
SOURCE: horn press panel on steering wheel
remove the airbag !!! but disconnect the battery first and leave it for 10mins or so every thing is behind the airbag.
SOURCE: VW Polo Classic, fuel efficiency problem
Has the car been serviced recently?
If not I would suggest getting it done.Not sure if you have diesel or petrol, but oil can thicken causing more load on the motor and airfilters get blocked and can cause a rich fuel mixture.
If petrol you can take out the plugs to check if they are a light brown colour, if very dark or black you need to check and adjust carb/injection settings/filter.Need to know what engine it is really.
SOURCE: 1997 Ssangyong Musso engine has erradic idle & intermittent start
i think the problem is in the fuel line. i have encounter it too.. the best way is to replace all fuel filter. muzzo have 3 fuel filter. 2 located at the engine and the other one located at the fuel tank they called it as strainer. u can see the opening of the tank underneath the back seat of the car. also good suggestion clean the tank. duel dirt is the main cause of your problem cause muzzo have only a small tip that why only little dirt can cause plunging in engine. sory for bad English
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