Been chasing down this issue for awhile now and can't come up with anything. Car has an M50tu with a holset turbo. Was running great, and slowly started to lose power. Afr's show it is running pretty rich, around 10 at full boost (18psi). When the car is out of gear or in neutral and you press the gas, it will hesitate around 3500 rims and will start to spool and build boost. It will make full boost if you let it. Also while driving it, will randomly choke and cut out for a sec. Makes boost like normal but doesn't have much power. Things I've checked. Compression is good, plugs, swapped different coils in, fuel pressure, fuel filter, boost leaks. Anything I might be missing?
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