Cold Engine

[Galaxy quest 71]

Hi, after advice nit sure if this is the right section to be on.

I have a Galaxy ghia 55 plate 2006,

Only had it a few months and when I start from a cold engine it won't go above 15 mph. If I sit and warm the engine first it's drives great.

After a bit of advice I have changed the Maf sensor, the Map sensor and the air filter.

But it still won't work properly.

Could it be the fuel temperature sensor??

Any advice would be greatly appreciated

Just bear in mind my knowledge of engines consists of fuel in one end and oil in the other.

Thanks in advance