Sounds like you've got a boost leak to me.
If your car is that bad, it will leak like a sieve on a smoke leak tester!
As Don said, take off the aftermarket TCV and buy a new OE one. Would really love to know how you checked the coils as they only really cause poor idle or ignition issues under load!
One more thing....(echoing what Don said really
)...You should get your car to 'stage 0' first before you do anything else, otherwise you're forever going to be chasing your tail.
Just Google
Volvo stage 0 tuning...read, digest and then do it to your car. Otherwise, to put it bluntly, you're wasting everyone's time, including your own
Only on the ECM
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