Saw the post on the Fiesta kangarooing & thought someone may be able to me.
My daughter's '96 Punto 55s (1108cc) kangaroos on low rev levels in each gear. It doesn't seem to matter whether the engine's cold or hot. Once higher up the rev range (2000 rpm or above, this is a guess as no rev counter!!), there's no problem. I've changed the Lambda sensor, but no difference.
Anyone any ideas that a DIYer can look at without expensive equipment or "trusting" it to the Fiat dealer to sort out?