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Car has been running//idling fast, or too slow for about a month now, or while stopped at lights. For the last week been randomly acellerating, especially going downhill - and when my foot is off the gas pedal.
Model -- 1994 Golf CL - 1.8 litre - monomotronic
most recent part replacement -- about a week ago -- throttle body flange
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The simplest things can cause the most trouble - I would start with a load test on the battery - may seem to be charged after using a battery charger, but can have plate connection problems causing failure under load.
to cut the long story short
take it to an accredited service center and have the fault codes read
Indicates a problem EVAP system not venting properly and causing pump and fuel pressure problems
If you take it to a mechanic and he doesn't run the fault codes with a scanner first , take it some where else
The KAM circuit for the PCM and the a/c is on the same circuit. If the PCM does not have memory voltage it will loose the settings every time you turn the key off. You might want to check the fuses in the engine compartment for a blown fuse for this circuit. Of course it could have another problem too, such as a faulty idle air control valve.
the gas cap and check engine light thing are related in terms of the EVAP system, or the evaporative emisions system. This is NOT where your surge, or "chug" is coming from. The surge could be coming from a Exhaust Gas Recurculation valve that is starting to bind or "hang up" a bit. DO you notice this happens more at lights, or when coming to a stop? if so it could be an idle air control vavle.
do a compression test,if that checks out,oil gets in spark plug wells and sometimes not running on all 4 plugs pull spark plug boots and use paper towels twisted up and clean out oil around plugs and clean the end of the boots,
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