I need help

Asked by Nov 09, 2014 at 09:26 AM about the 2007 Ford F-150 XLT

Question type: Maintenance & Repair

I have a 2007 Ford F150 XLT Triton My problem when I first start my truck the idel is high
it runs great, but after truck warms up it stalls went I apply the brake it stalls. I noticed in
drive the RPM'S jump between 700 RPM'S down to 300. Just goes up and down.

4 Answers


It could have a vacuum leak. check for vac leaks, especially to the brake booster line.

I changed the booster. I had someone tell me that was the problem, but it wasn't. then I had someone tell my the plugs had to be replaced so I replaced them. I had replaced the battery in the truck with a 650 cranking amp that's when it all stared had a 550 cranking amp in it. I asked if maybe could be the problem and they told me no wouldn't be the problem. So I don't know.


don;t see the battery cca making a difference, the whole problem still smacks of a vac leak. maybe pcv

Best Answer Mark helpful

I'll try that maybe that may be it. thank you..

Your Answer:


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