Can someone explain to me how a bad fuel filter can cause hesitation and back firing only when the engine is cold? Thanks, D² & 6530 Dan, Before you try to trouble shoot the fuel injection I would suggest changing the fuel filter. That corrects the symptoms you describe more than half of the time. Do you know when it was last changed? A bad CPR won't allow you to accelerate at all for a few minutes with a cold engine so I doubt it's that. Here is something ponder over. When I start my car after sitting for the night it starts up fine. When I give it gas to get out of my driveway and up the street, I notice I lose acceleration. I then here a slight backfire in about 3-4 quicks pops. After this the car runs fine and I don't get it again until the next day after sitting overnight. Any thoughts on the cause of this? Thanks! [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/