The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - "Misses" at Idle, but not at cruise RPM???

**Wrenchbender Ret** · 07-09-2021, 10:50 AM

Check for a vacuum leak at the vacuum outlet in the manifold. It can lean out 1 or 2 cyls. & cause a rough idle & miss at idle especially with an auto trans in drive. Check the power brake unit, trans modulator & heater/ac vacuum hoses & reservoir.

George

07-09-2021, 10:50 AM	#4
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,190	Re: "Misses" at Idle, but not at cruise RPM??? Check for a vacuum leak at the vacuum outlet in the manifold. It can lean out 1 or 2 cyls. & cause a rough idle & miss at idle especially with an auto trans in drive. Check the power brake unit, trans modulator & heater/ac vacuum hoses & reservoir. George