when I stop at redlight, car idles rough, jumps and acts like it's going to cut off. Fixed one sensor, cleaning another today. What could be the problem now?

Asked by Oct 26, 2014 at 04:17 PM about the 2003 Ford Focus ZX5

Question type: Maintenance & Repair

Ford Focus 2003 zx5 hatchback.  Oil/filter recently changed, injectors and spark plugs
havent been yet.

4 Answers

65

Be sure to check the fuel pressure regulator. It sits just before the fuel rack for the injectors. FYI Ford is out of them till Nov. and they cost about $100+. I got one for free at a junk yard. You need to pull the fuel rail to remove and replace the reg.

10

Changing the spark plugs to my 01 focus made no change in this type behavior. I changed the Throttle Position Sensor, and it runs better than ever before. Very inexpensive repair, and no more stalls when sitting at an intersection.

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