I've had my 197 for 2 weeks today and am now used to the car, however what is baffling me (and a friend who drove it today) noticed that one minute the car feels like it pulls very strongly and a minute later it feels like it has no guts at all, we are talking about the same gear, same roads etc. Sometimes I also get a slight hesitation around 4K rpm if at partial throttle so I wondered if there could be something wrong with the throttle body or the pedal itself? Since I've owned it it's only been run on super-unleaded and new OEM spark plugs were fitted today which has made no difference. Anybody else experienced the same issue or does this sound like a normal characteristic of the car? Any help greatly appreciated. Thanks for reading.