My NF Fairlane has started not liking being cold and taking off otherwise it will almost die its fine once it reachs normal temp any ideas ?

and incase anyone is wondering it idles at roughly 550rpm and and idles fine only just during take off as it will have a big flat spot in acceleration and to get speed i have to put the pedal to the metal then back off and keep doing that till it reachs a temp its happy at running with and if im sitting in the drive way for eg in drive with my foot on the brake the motor will go down to 150rpm and almost die on me

its got 280,000 on the clock and the only thing that has been replacement mechanically that isnt under maintenance is the power steering pump and water pump and maybe the A/C Compressor so the motor has done exceptionally well

Head Gasket--If it's losing coolant..

If not losing coolant probably try cleaning the ISC and throttle body with carbi clean. Also test the voltage at the ISC from the ECU output---ISC circuit in ECU can fail. It happened in my EL ECU and was displaying the exact same symptoms that you desribe and only on cold starts...

Coolant temp sensor can also cause problems on cold starts. Simple check is put the dash in diagnostic mode and check the coolant temp. Base lowest value is around 30 degrees at a cold start then should climb...

aint loosing coolant and coolant temp sensor works cleaned the isc must be the circuit if thats the case

could be lots of things. your inlet manifold gasket could be leaking a little bit when cold. but when it warms up, metal expands, clearances close up. no problem.