1977 Ford Bronco extremely rough idle..smoother at higher R

1977 FORD BRONCO
177,000 MILES • V8 • 4WD • AUTOMATIC
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KROWENS76
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extremely rough idle..smoother at higher RPM...I checked all vacum lines and don't see any leaks/cracks etc. tried to listen while running but it shakes so hard that everything on my truch rattles. When i drive it, it smoothes out but not completely. Seems as though it misses a little. When i come to a stop sign or put it in park to idle it shakes so bad my vision goes blurry. This just happened all the sudden when I stated it up 2 days ago! Engine recently rebuilt about 7,000 mi ago and carburetor rebuilt 6 mo. ago. All new plugs, wires, cap and rotor 6 mo. ago as well. getting very frustrated trying to figure this out..any help?
Oct 29, 2008 at 11:30 AM
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RASMATAZ
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Hi krowens76 and welcome to 2carpros

Check the choke plate is it fully opening when engine comes up to normal temp, Inspect and test the PCV and EGR valves-also check the fuel pressure. Make sure there's no loose sparkplug wires.

Might wanna check the air/fuel mix adjustment and curb idle
Oct 29, 2008 at 1:55 PM
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KROWENS76
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my EGR valve doesn't have any vacum lines coming of the back of it and it never has since I have owned the truck. Should there be one hooked up to this. if so where would the other end go? Also, should I get a new EGR valve to see if that fixes the extremely rough idle problem?

thanks
Oct 30, 2008 at 3:39 PM
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