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Rough running after warm up 700 1989

My 89 740GLE is giving me Hell. It starts and runs until the engine warms. Then it cuts out and and I have to play with the throttle to get it home. I get codes of: injector clogged or not getting power, Lamda Sonde not responding and Speedometer not providing signal. Does any one have any suggestions? When it starts acting weird, it will back fire through the intake manifold.
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