Great news!
I have a similar problem that I have been chasing for a few years now.
Intermittently, not every time, but seems more prevalent when hot, the old girl limps as you say to about 2200 rpm then bam, all the power in the world!
I actually over the last few years replaced the IC with a larger D2 core, cleaned the inlet manifold, removed EGR and replaced MAF. I was chuffed for about 4-5 weeks when the power was there immediately every time.
Then the problem came back!
I am beginning to think that it's something else...maybe trans control unit.
I will also try and flush the IC again whilst still in the car.
Anyway great news that you solved your problem...I am amazed just how much performance degrades when the IC gets a bit of oil in it.
Cheers
Ralph


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