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I had similar problems. You might try checking the PCV valve hose located on the lower rear side of the throttle body (approx 10" below top of throttle body). I found mine melted with a hole. If you follow the hose through the emission components, it leads to the PCV valve in front of the engine.

AnswerI had the same problem on my SVT Focus 2002 (same as ST170) but it was the fuel filter. I .

My '99' focus was doing the same thing. A month later and it seems the ecu has gone down. Although it does seem like I'm the first this has happened to.

i have to same thing happen how can i fix it

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โˆ™ 2015-07-14 14:58:49
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Q: What are some of the reasons your 2000 Ford Focus is hesitating and popping when you step on the gas?
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