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
42,904 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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