Juddering/hesitation at very specific rpm

[dan112]

I've been driving around this for a while now but the 172 has got a hesitation but only if you accelerate when the revs are between 1500-2000 it never hesitates or misses over 2000rpm so I don't think its the usual suspects like coil plugs leads injectors etc because that would cause a misfire at any revs could a lambda cause these symptoms? Any ideas welcome cheers

 

[clioben182]

Mine was doing a similar thing. Swapped the lambda's around (mine is decatted) and it cured it straight away.

 

[dan112]

Good idea I forgot that you can swap the two lambda sensors around I'll give that a go