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Custom: My 1977 Ford F100 starts but will not idle.

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My 1977 Ford F100 starts...
My 1977 Ford F100 starts but will not idle. Unless I keep my foot on the gas, it dies. Any thoughts on what the problem might be?
Submitted: 3 years ago.Category: Ford
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Answered in 22 minutes by:
5/20/2015
Ford Mechanic: ASEMaster35yrs, Master Auto Tech replied 3 years ago
ASEMaster35yrs
ASEMaster35yrs, Master Auto Tech
Category: Ford
Satisfied Customers: 2,095
Experience: ASE Certified since 1972,Master Auto tech,Heavy Truck,worked on all makes and models
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Glad to be of help. The first thing to check for is vacuum leaks. Also Check your carburetor. First tell me what engine & trans you have and what carburetor is installed. Does it run fine except for idle? How long has it been since last tune-up? Does it die at idle when cold or only after warm up or both?
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Ford Mechanic: ASEMaster35yrs, Master Auto Tech replied 3 years ago
Let me know what engine you have.
1977/79 F100/350 2WD's came with: 300 I-6 / 302 2V (F100/150 only) / 351M 2V / 400 2V / 460 4V.
EZ way to ID what engine it has: 302 = 6 valve cover bolts, 360/390 = 5 valve cover bolts, 460 = 7 valve cover bolts, 351M/400 = 8 valve cover bolts.
The 4th digit of the VIN will tell what size the engine was, when it came from the factory.
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Ford Mechanic: ASEMaster35yrs, Master Auto Tech replied 3 years ago
if it only has problems after warmed up, check EGR valve and related parts and check for vacuum leaks. Especially carb base gasket & EGR gasket.
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Ford Mechanic: ASEMaster35yrs, Master Auto Tech replied 3 years ago
Does your carburetor look like this?
http://www.summitracing.com/parts/urm-7-7583/overview/year/1977/make/ford/model/f-100
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ASEMaster35yrs
ASEMaster35yrs
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