Low End Power Loss

[Snow goose]

Have a Disco 300 Tdi 1995 Auto. Have recently and over quite a short time frame noticed a drop in power until I reach around 2500 revs. Not blowing any unusual smoke.

Once it reaches 2500 it takes off as normal. Any suggestions would be welcomed

[loanrangie]

Check the slack in the auto kick down/ throttle cable and check condition of inter cooler hoses, then check valve clearances.