Rough idle after deceleration...

[Hartman]

Occasionally, when I slowly stop for a red light, with gentle pressure on the brake pedal, my truck will start to sputter a little bit and will act like it's gonna stall but it never does, but the truck runs really rough when stopped. Once I hit the throttle and start to accelerate again, it's fine. It only does this maybe once every few days.

This isn't really a big problem right now, but does anybody know if it's a sign of things to come? Or is it just something that a high milage engine does on occasion?

 

[Alec]

Maybe FPR sticking?

 

[Hartman]

What's an FPR? Never heard of that before.

 

[Alec]

Fuel Pressure Regulator

I guess you don't read any engine threads.

 

[Hokie]

Originally posted by Alec
Fuel Pressure Regulator

I guess you don't read any engine threads.

Didn't know either... but now that you mention it, it might be a nice candidate for inspection

 

[Billy177]

check and clean your iac and your maf

 

[Hartman]

They are both clean.

 

[aldive]

Do a scan and check the O2 sensors .

 

[joehawk]

This is probably way off, but if the stumble stops as soon as the brake is released, I would wonder about the power brake assist [runs off vacuum]. There is a slim chance that the vacuum assist is sucking in air thru a leak when the brake is depressed. I would let off the brake as soon as the stumble occurs[providing it is safe to extend the stopping distance]. If the stumble stops immediately, I would investigate that area further.