4.2 getting slower

[jako999]

Hi all I haven't posted for a long time we have owned our 4.2 since new and it's been a great car apart from a few bits Inc.  the ecu. Over the past few years the car is getting slower  I don't drive it very often  but I did the other day and I couldn't get it up to 70 on an up hill slip road onto the motorway  once on and on the flat it crept up into the 80's and held it but there is no real go. Over the past years it's had services Inc plugs, injectors, filters and so on. The wheels are all running fine not getting hot. It passes it's emissions  at mot time and so on.

Any ideas? Thanks in advance. This 

 

[crofter]

Have you checked the transmission fluid as detailed in the handbook