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Old 05-17-2013, 08:06 PM   #1
ricmarcarp
 
Join Date: May 2013
Vehicle: 1969 Mustang Grande
Location: Michigan
Posts: 7
Angry sputtering cleveland

have a 69 grande with a Cleveland motor that runs good as long as your pushing the gas pedal, if you ease up, it starts to run rough. idles fine, any ideas?
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Old 05-18-2013, 02:31 AM   #2
67mustang302
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You're saying it stumbles when you let off the throttle? In neutral, deccel in gear, what rpm etc.
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Old 05-18-2013, 12:48 PM   #3
ricmarcarp
 
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not a problem in neutral, haven't really checked the rpms when this is happening, all this started when I took it in for a tune-up a couple of weeks ago.
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Old 05-18-2013, 12:51 PM   #4
ricmarcarp
 
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it runs strong & sounds great until you let up on the gas
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Old 05-18-2013, 02:20 PM   #5
67mustang302
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So what, when you're cruising normally and just let off the gas?

Does it idle rich?
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Who cares how much horsepower it has, all that matters is how fast it goes!

Untested 331, lots of suspension, chewing up corners.
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Old 05-18-2013, 05:56 PM   #6
ricmarcarp
 
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Yes, it does it when I cruise, took it back to the shop and they are going to check the
carb on Monday.
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Old 05-18-2013, 06:57 PM   #7
67mustang302
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It could just be a slightly rich idle and/or no dashpot.
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Who cares how much horsepower it has, all that matters is how fast it goes!

Untested 331, lots of suspension, chewing up corners.
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