Hello, 04 GT 47K miles, 6-speed manual. Recently (last two weeks), when the engine is warm, in second or third gear, just after shifting, when accelerating, there is a slight hesitation for about two seconds, then acceleration is normal. Only occurs in second or third gear. During the 2 seconds of hesitation, the car feels like it "shivers", then acceleration is normal. There are no codes. Mileage would be tough to estimate due to substantial warm-up in this lovely northern Wisconsin winter.Any recommendations? I was considering adding an injector cleaner to start.