[emilys]

Hi - I own a 1972 Mustang with a 351 cleveland, when I get her up to 40-45 mph the engine sounds ruff (like it's having problems turning over) but then when I get to about 60-65 mph it is fine. Anyone have any ideas? Thanks!

[jim293]

Welcome aboard. Lets try your question in here.

[emilys]

Hi Jim293! I hope I get some feed back! We sure could use some of that California sun here in WI!

[Cobra Jet 351]

Welcome to AFM!

[emilys]

Thanks, I like the yellow and black paint job on your 1973, I have to figure out how to upload a picture to my profile!

[nigel]

Welcome to the site.

[Calponycarsmike]

Could be a vacum leak, or or the butterfly sticking on the carb, I had a Fiat that was doing the same thing and the carb was hanging up so it would not idel or do low speed, but over 50mph it ran like it was a new car. It could also be a timing issue.

[cindys_sn95]

try a new fuel filter. also as mike stated check timing. maybe a complete tuneup is in order?

[andrewmp6]

I would start with a standard tune up that should fix it or help.And i would look at a pointless ignition upgrade it will run better and no points to ever change again.

[oldmountainfarm]

Sounds like a carb problem. Maybe time for a carb rebuild. What carb are you running?