TD42 missing at 1800 rpm

[webfish]

Long time since I was last here.

My 1990 Safari TD42 has suddenly started missing at 1800rpm. I though it was probably the fuel filter so changed that but alas, no better.

Basically, runs fine until you hit that rev range then there is a sudden loss of power and the vehicle simply won't push through. If I back off a bit she drives fine.

Any ideas before I take it to the garage?

[MihiT]

If it's auto, I blame the box.

If not. How many KM since: Air cleaner? Injectors?
Check rubber lines/connections for vacuum leaks
There's also a secondary gauze filter atop the IP. Remove and clean.

[webfish]

Thanks, vehicle is manual and must be about 350K on the clock.

Haven't done the air-cleaner in a couple of years but she's had pretty light use due to company ute. Might be worth replacing anyway.

What's the IP? Once this gets too technical I need to seek professional help but it's worth trying a few obvious things first

[webfish]

FFS. Changed the air-filter and it runs sweet.

Thanks @MihiT

[MihiT]

What's the IP? Once this gets too technical I need to seek professional help but it's worth trying a few obvious things first

Injector pump. Is one banjo bolt on the fuel feed into it, spring and mesh filter underneath. Easy enough to get to. Need fairly fine hook/pick to pull the screen out.

Simple things often overlooked, glad it was an easy fix!

[MihiT]

FWIW I run a K&N washable/oiled filter in mine. Spend a lot of time on gravel, and manage to pick up all kinds of road grime sludgy crap as well. When performance (such as it is ) drops off I generally give it oil and filters.