Vts flat spot on acceleration

[Gjl205xs]

Hi
Have problem with vts engine converted into 205
Single plug ECU
Right if I floor it pulls hard till 4k then feels like it hits a wall but still revs out
Was happening every now and then but all the time now
Any suggestions? Or experience with this problem
Any help will be much appreciated 👍

[Gjl205xs]

Any ideas?

[MartinObviously]

That could be literally anything.
Coil pack
fuel pump/injectors
air leak
failing flywheel sensor

[Gjl205xs]

Cheers martin
So IV got new walbro fuel pump
Injectiors cleanned , checked
Swapped crank sensor with known good one
No air leaks
Only other thing is when first started hot or cold I'll drive down road and completely bogs I either have to lift my foot off and on or floor it
Only thing I haven't tried is map sensor
Anyone know if these are the symptoms?
Many thanks
Gary

[MartinObviously]

When you first start, the ECU runs in open loop, ignoring the lambda sensor.

So, if its bogging it's putting in too much fuel

If it's hesitant then it's lean.

Too much fuel with a normal ECU is either wrong fuel pressure reg or rail plumbed has been plumbed in the wrong way.

The injectors have been changed and the wrong flow rate installed is a possibility too.

I'll bet whoever swapped the loom in, didn't include the wiring for the diagnostics plug or the EML either.

You might have a faulty TPS, but that wouldn't account for the sudden change at 4000rpm.