Stuttering at high revs and cutting out at idle

Hi guys. After replacing engine I'm getting engine cut outs on idle and 5-10 sec cranking before starting again. Also at around 2800 revs power begins stuttering and can't be pushed any further (most noticeable at high speeds, but can feel it at very high end of acceleration in low gears too). Does feel like an overall lack of punch. Other than that drives fine and just passed its MOT (luckily no cut outs during the test!)

I've replaced the FPR as it sprang a leak, assumed that was the problem. Hasn't made a difference. Replaced fuel filter and also air bleed valve (although this was salvaged from my breaking disco, but which ran ok. I replaced all injector seals and washers when I put the new engine in, so hopefully not those. Fuel pump is pretty much brand new. Not getting any smoke whatsoever - seems very clean.

Was thinking maybe turbo actuator related, but wouldn't explain cutting out and not wanting to start...

Any ideas?

Hi. Did you plug in a tester ? if not you should do that before we start a guessing game

sierrafery said:

Hi. Did you plug in a tester ? if not you should do that before we start a guessing game

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Hi mate. I don't have a Hawkeye/Nanocom if that's what you mean? May have to take her to a garage. I'm gong to check the wastegate actuator, loom and anything else I can think of today. Was kinda hoping for some vague ideas to investigate, but you're right, I should get it tested!

Seems to have been oil In the ECU loom, which is a surprise but makes sense.