Re: 156 problem
Yeah, I have had the same problem with my car the exact same one.
Feels like its holding back for a while then when warmed up bingo!
Since I've changed my tensioner wheels which disintergrated because they're made out of f00kin plastic, it seems to be an awful lot better.
These 2 tensioner wheels are NOT on your cambelt so don't panic, they on the belt that runs your power steering air con and alternator, they're run from the crank.
I would have a little listen to the car outside when it starts up any slight grinding noise? if so get them done asap.