Right, Ive about had it!

Skoda Favorit Est LXi, 94 M reg, 13200 miles (yes, immaculate in white too), is loosing all throttle power when up to operating temperature.

Starting fine, idles perfectly sewing machine style, runs perfectly and does all things I ask of it and more, dual carriageway etc no problem at speed.

HOWEVER, problem starts only at operating temperature when either,

1) accelerating away from when at stop from a juction, or

2) accelerating from a slow tight bend, or

3) slowing for a junction from when at normal speed.

All of the above happens when under say 35 mph. Can sometimes start again immediately, when first realised the problem needed multiple efforts to start but i suspect it was only until the car had cooled enough to allow it. When starts it is running perfectly as before until 5 miles down the road when it decides to do it again!!!

All temp guages etc reading normal. It has an immobliser but that works fine.

Work thus far:

New coil, new spark plugs, rotor arm, crank shaft sensor. VW sepcialist tried diagnostics using flash code but no information there.

I will now replace the fuel pump relay, if this doesnt sort it it has to go unless somebody, anybody, can diagnose the problem. Bosch diagnostics will cost £200, throwing money down the drain if they cannot provide solution.

Im at my wits end, can anybody help? :(

I'd start by cleaning the throttle body.

I agree with above, clean the throttle body. Also worth checking and adjusting the valve clearances. Follow these instructions in this excellent post, no need for feeler gauges http://briskoda.net/forums/topic/90342-the-proud-owner-of-a-tractor/page__view__findpost__p__1108203

13,200 miles is all well and good but how long has the oil been in there etc? It may be worthwhile changing the oil and filter too and maybe running a flushing oil through. May also be a good idea to replace the air filter while cleaning the throttle body.

I would also not bother shelling out on diagnostics. The Bosch monomotronic system is rather basic and unlikely to give much information - there isn't much in the car to go wrong anyway.

Sounds fuel related to me, is there a filter on it that can be changed?, they are usually close to the tank. If not a blocked filter, then the fuel pump.