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Sounds like a bad valve lifter or a valve out of adjustment. It's probably a bad hydraulic valve lifter. In idle, when the oil pressure is lowest, it is not filling with oil. When the motor revs up, oil pressure rises and fills the faulty lifter.
If you do have mechanical lifters, the valve is probably out of adjustment. If you do car work, pull the valve cover and see if it's adjustable. Of course, you'll need the specs from VW/Audi.
Otherwise, it's probably a shop job.
I had a VW rabbit that developed mad electrical problems. It started when one day the headlights remained on and would not shut off. It turned out that a $2.00 gasket for the antenna wire had failed. This allowed road water from the wheel well to leak onto the fuse box. In time the fuse panel corroded and shorted out. I had to replace the fuse box twice and use rubber epoxy to seal the leak. Check all fuses and electrical wiring for signs of shorts or corrosion.
it might be the e break sensor . ive heard of them causing shut downs . also check all fluid levels if your coolant is too low the sensor will shut it down lol. and i think theres a break light recall that might have something to do with it . take it in to vw if you have the means for a scan . of find someone in your area with a vag com . it can read the error codes from the computer . good luck
It sounds like the hydraulic lifters are bleeding down after sitting for a while... there are ball checks which are supposed to prevent this... Try using a good engine flush (a product that frees sticky lifters) and replace the oil with a good synthetic... Hope this helps...;-)
Might be a bad valve adjustment (yes, valvetrains with hydraulic lifters still have some kind of adjusting mechanism), or lifters which get airlocked (bleed down fast and have a hard time pumping back up by themselves)
ive had this problem the loud tapping noise if properly you have the wrong oil in the engine the lifters only have a very small hole in for the to get in so if it to thick it cant get in causing the slapping noise.