Where is the best place to get one as I think mine is maybe gone after reading symptoms. But where can I get one? Or does anyone local have one I could borrow and try to see if it's any better?

Thanks

 

I have never replaced a defective map-sensor on a Cosworth or a Lancia Delta.
That doesn't mean they can't go defective, but chances are it's something different.
What's the problem?
Measure signal voltage from the sensor at key on, engine off.
Measure 5 volt supply.

 

Poor low idle, hesitation on acceleration when turbo on boost and poor mpg. Changed lambda as wiring was slightly melted from manifold. Car seems to be overboosting as it stutters only in 3rd, 4th and 5th between 3000 and 4500-5000rpm. I can't see actuator properly as it's under manifold so I ordered a used focus RS one to put in as I think they're the same but a pal said may be map sensor. No boost gauge ATM though so not sure exactly what boost does when it stutters.

 

If this is for a Focus, I would start with a code read.
Then check sensor data to find the one that is causing this.

 

Focus with escos loom and turbo conversion.

 

not a tiny air leak on vacuum pipe or somthing?

 

If its a T190 its a 1.8 Zetec running standard internals, uprated valve springs and Pectal T2 engine managment. These very rare T model Focus seem to be playing up allot lately, i have a piston from a T230 sat on my desk next to me as a result of trying to get to the bottom of rough running