(T) Fuel Intection related stalling and stuttering

Well im not saying its fixed that could jinx things and im feeling superstious these days but I will say its working perfectly now. The replacement injector seems to have done the trick. The car ran fine with no smoke from cold this morning.

Nice one, time to start enjoying driving the Bravo.

100miles later and the same problem seems to be creeping back in. Any ideas or advice would be lovely.

Today at idle the car would sit at 800 but then drop revs, each time the car caught it and stopped it stalling. Before the replacement injector it would stall. At say 20mph ive had twitches seems like the engine is braking the car. I think because the revs are trying to go right down..

Could it be bad fuel?

My next moves are to inspect the throttle position sensor and check earth points in the engine bay. Would the idle stepper motor effect the car even driving say at 2500rpm

Other than that all I can think is the loom has a bad wire.

97% of the time the car is fantastic but this niggly problem is annoying I dont think it would be safe on the motorway.

The car has never missfired and there is no odd smoke at the moment. Through all this and apart from this blip the engine really seems gutsy and solid.