Nigel Yardley
We had a hesitation similar to what your describing on an astra, Turned out it was worn crank sprocket keyway, and crank pully bolt not 100% tight.
It would only happen on the road, never in the workshop, and i would have sworn it was ignition related.
Worth a look. if you run out of ideas
hth Nigel
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Vauxhall Astra 1.4 X14XE 1998 - Slight hesitation through the rev range # - Sam Green October 27, 2011, 4:34 pm
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on November 16, 2011, 5:35 pm, in reply to "