idle problems and wont coast under 3000rpm on 4age in ke70

[imprezd]

ok this is driving me nuts any ideas would be great..

ok problem is at idle it will be fine for a minute then idle just drops and engine starts to splutter and die for a few seconds to a minute then it will smooth out again and idle fine..

And the other thing when car is coasting and the revs are under 3000rpm its undrivable it coffs and splutters untill its under load then it clears out and excelerates..

ive tried changing the map senser, dizzy ive tried finding any vacume leaks
i have changed the engine from big to small port so the only thing missing is the TVIS from the intake manifold all other bits are fitted

[H8CHIR6KU]

maybe the tps is outta adjustment?

[imprezd]

ive tried that too

[H8CHIR6KU]

whats fuel pressure like?

[imprezd]

all sorted needed to adjust everything again thanks H8CHIR6KU

[H8CHIR6KU]

glad i could help