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Old 11-13-2012, 12:08 PM
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Need advice

I got a 77 351 Windsor, completely rebuilt. Got less than 800 miles on it. Started out dying every once in a while..so I thought it was bad gas drained the tank and still the same problem so i put a new fuel pump rebuilt carb new plugs and wires, points and new coil. Now the truck won't even idle correctly and if u give it gas it wants to die. Timings on cause if u do get it idling good and give it gas it'll purr like a kitten till u take ur foot off the gas and then u get a rough idle...please help

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Old 11-13-2012, 12:18 PM
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if you take one wire off the plugs one at a time and reconnect it is there one that does not seem to make a difference if its on or off. Using a timing light on each plug wire may work as well.

You rebuilt the carb after it started running poorly or when the engine was rebuilt. did the carb work properly after the engne rebuild until it started running poorly.

Did you check the push rods to see if they are all adjusted correctly. sometimes they get out of adjustment during the first 1000 miles but it does not happen that often.
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Old 11-13-2012, 12:22 PM
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Carb was new, started running bad changed everything else then rebuilt carb
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Old 11-13-2012, 12:27 PM
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Quote:
Originally Posted by klassickarman View Post
Carb was new, started running bad changed everything else then rebuilt carb
must be a bad ground so where. check voltage at the coil and make sure it has full volts at idle. also make sure the engine is grounded and the coil ground is good.
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Old 11-13-2012, 12:56 PM
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Need advice

Here is some suggestions to check out. Take a can of starter fluid and spray along the intake where it bolts to the head. Also spray the front and rear of the intake checking the gaskets for vacuum leaks. You can spray the carburetor base gasket too. The engine should smooth up or the idle will increase. If you have an electonic distrubutor check the module and the pick-up coil assembly. Take a vacuum gauge and do some testing with it. Here is an article on engine testing with a vacuum gauge.Technical Articles: Engine testing with a Vacuum Gauge - at Greg's Engine & Machine
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Old 11-13-2012, 03:44 PM
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Quote:
Originally Posted by klassickarman View Post
so i put a new fuel pump
Check pressure at the carb. Adjust or change pumps for max 5-6 psi fuel pressure. Carter "muscle car" pumps will work well, yielding 5 1/2 to 6 psi.
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