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Need more clarification when driving and park. Happen to vw a lot with no solution.
Could be electrical ( Tcm + Wiring conector, ECM) ( fluid change fluid+filter add lucid tray oil) or mechanical.
Rattle could be engine or evap thing located under or next to air filter. Alternator also.
The engine you speak of is know for sludge build up problems by VW. They've even made recalls base on what I've heard. Check oil circulation and how to fix oil circulation problem.
Drop the the oil pan and clean filter screen where it sucks in oil. Other things related need to be unclog..
could be anything causing this like a timing belt change and the timing isnt correct to a new fuel filter needed ask a local mechanic to have a look is the best idea ,because it could be a turbo and one of the air intake pipes is collapsing or the turbo is finished
Idle is automatically set&monitored with a timing sensor on the camshaft, i found my engine(1.8 20v turbo) would idle low then go high and almost stall sometimes and all i did was remove the fat black pipe on the throttle and clean inside the throat with a cotton rag dabbed in wd40.Hold the throttle open manually and clean on and around the throttle plate as the oil burnt&recycled creates a hard carbon that stops the throttle working correctly.When did you last change the sparkplugs, air filter, oil and oil filter and remove damp from the spark plug area using wd40 on surfaces applied with a cotton rag.These contribute all to your problem.As you dont state milage etc it could be a worn engine or slipped cambelt(1-2 teeth can make a slight diffirence).
Check fuel system. Leaks,Dirty filter can cause this
condition. You could have gotten a tank full of bad fuel. If this is the case ,you must drain all fuel and dispose of it properly. Change the fuel filter AGAIN.
This should keep you busy this weekend.
OH, by the way you may have to replace the Turbo!!
air filters cost less than 10 euro, replace them every 10,000 miles and you will never have a problem. Also if you use a fuel additive such as "DIPTANE" you will clean up on emmissions, and the environment, and fuel bills. another cheap fix I had from driving vw's was, GET A TOYOTA. CHEAP AS CHIPS. also just as reliable, without as much hassle. VW like to be AUDI and charge you more than MERCEDES