A hello in the round, I come from the A8 forum, but my father has some problems with his then () new re-import Santa Fe, petroler, 2.7 ltr. 189 hp. (139 KW). This has now 143,000 km on the clock, ZR etc. were changed at about 105,000 km. All services etc. made. Problem: Since about 15,000 a single, sudden jerk who goes through the vehicle… Not bad, driver realizes it, an uninvolved not… It annoys him, me too… We are very sensitive. The spark plugs at 105,000 km changed, again when the problem was already there, before about 10,000 km – problem remained. It is neither dependent on rotary zhal, nor on speed and can NOT be reproduced. MEIST it occurs from 140 km/h on the highway, with MEIST under load, but also not always. Then it can also be two, three rucksacks by irregular distance (but shortly after – so 8-10 seconds). The contract workshop says: error memory empty, drive until it IMM ER occurs. Freie Werksatt says: Error memory empty, hmmm…. Are there any tips for me here? Thank you and many greetings Michael