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I have a 1993 520H that was running fine during the last snow fall and plowing in early December 2014. So with snow predicted in the next few days I started it this morning only to find that the engine would not run smoothly unless choked significantly and with the throttle set high. And, it won't stay running with out choking and setting the throttle high. (no trouble starting) It seemed to lope (fast-slow-fast-slow) as if the fuel was being constricted, unless almost fully choked and the throttle set high. I changed the fuel filter without no improvement. I also let it run for about 20 minutes to see if that would help clean out a possible restriction, but with no improvement. This problem occurred since my last successful plowing in December, so it seems to me it must be a fuel delivery issue. I have used regular gas with ethanol and a fuel stabilizer in previous 10 winters and never had any starting or running problems. Thanks in advance for any suggestions that may resolve this problem. Stephen
