Question about German 1991-1992 BMW 850i Engine Cooling Fan Blade W0133-1614194

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I have a power problem with my 1991 BMW 850i.

It started with hesitation then it would be fine, then came what seemed like half the power while driving normal but after applying more gas power was there again, then came weak smile of exhaust fumes and half power, then came strong exhaust fumes and still half power, now hardly any power and can no longer drive it, when I start it up there is strong exhaust fumes and it will not idle I have to constantly give gas to keep it running then at a certain point while giving more gas it will eventually die/cut-off. I've changed the fuel relays, the fuel pump and filter inside the tanks, the fuel filters outside (left rear wheel), checked and replaced one of the air intake meters, checked the in and out fuel hoses under the hood behind the engine coming from the fuel pump, I tried to get a diagnostic read-out at two shops but their machine were not able to get a connection/read-out, I've had the car at a shop it costed me money and they could not find/fix the problem. I dare not take it to BMW in Germany for as they see me coming they will be rubbing their hands together LOL (thats too costly if you know what I mean) plus I paid at the other shops for diagnostic attempts and the shop where I had it trying to find the problem (not cheap especially in Euros). I am lost and need help trying to find this problem. I can only think now it must be a clogged CAT. Anyone out there can help me? FOR YOUR INFORMATION To FIX YA - In your "Find your product" section I only chose ENGINE COOLING because I assume no one has had the problem I have. I HAVE A POWER PROBLEM OF ANOTHER TYPE

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