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Ford
F-250
Engine
Symptoms
Idle Low
Truck missing at low RPM's
TERRY HOCKMAN
MEMBER
1999 FORD F-250
5.4L
V8
4WD
200,000 MILES
Truck misses at low rpm but if you speed it up a lot the engine runs find. What is wrong?
Sunday, May 5th, 2019 AT 1:18 PM
1 Reply
KEN L
MASTER CERTIFIED MECHANIC
47,282 POSTS
Hello,
It sounds like you have a vacuum leak but to be sure please go over these two guides.
https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge
and
https://www.2carpros.com/articles/engine-misfires-or-runs-rough
Please run down these guides and report back.
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Monday, May 6th, 2019 AT 4:16 PM
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