Hi people,

Am new here so apologies if it has been raised before!

My 1998 Freelander 1.8 seems to have developed a sticking throttle.
It all started when the exhaust started blowing which has now been replaced.

On a cold start the engine idles at aroun 1500 RPM but doesn't drop on e the engine has warmed up.
If I rev the engine the revs do not drop down, I have to switch off and restart!

I have checked the throttle linkage which seems fine and sprayed it all with WD40.
I then whilst fiddling pulled of a hose which attaches to the bit that says injection, lots of hissing air and the engine started to idle roughly.
Once I reconnected the hose the revs dropped to what appeared normal.
When the engine was revved the revs dropped once the accelerator was released.
All seemed to be sorted!
However after leaving the engine running for a while (to warm the interior), the revs started to creep up slightly. I revved the engine and the revs didn't drop - basically back to square one.
I pulled the same hose back off as before, lots of hissing and the revs went right up!

What's wrong? Any advice gratefully received

Many thanks

Chris