Cold running problem

[GregMcN2]

Hi
I know that the 172/182/197 are often hesitant/lumpy when cold - (this is my 4th one) but my current 182 is different in that when I start from cold after about a quarter of a mile when I am doing about 60 in top gear the engine feels as if it is going to die - no response at all but if I just drop a gear it clears and runs fine. As I said I am used to the normal lumpy starting but this is different.
Any ideas?
The only other thing I would say is that low speed fuel consumption is not that great, not diabolical but does not improve as much as others I have had.As far as I know engine is standard apart from catback milltek & K&N filter in std airbox

Thanks Greg

 

[Russ_16v]

First thing's first, has it had a cambelt change? If the timing is out it will run a bit lumpy, have worse fuel consumption and usually is flat at low revs

 

[GregMcN2]

It has had dephaser and belts relatively recently but the relatively poor low speed fuel consumption was there before the change and the problem I am asking about has only occurred in the last week or so, a couple of months after the belt change so I guess you could say the 2 problems are not related and timing is OK? Engine feels strong when warm/high speed. I was wondering if injectors ever need cleaning?