runnin rough...sometimes
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runnin rough...sometimes
Have a 99 superduty with 210,000 mi. recently started running rough...never had this problem before, and it doesn't happen all the time. When started it it runs as though there is air in the fuel lines, and sometimes it surges really bad like the big ol Detroit truck engines on a cold morning. Always seams to clear up after a few minutes, but after returning to idle sounds like its missing on one cyl. It doesn't seam to be affected by temp exept for the surging usually happens when cold...The last part replaced was a leaky fuel canister drain valve, and a new filter was installed at that time. this was happening before and after that though, but starts and runs great most of the time....any ideas??
