Help please, I purchased a 70 Mustang with a 351 W a few weeks ago. The car originally had a 2 barrel carb, which was switched to a 4 barrel with an adaptor plate (by previos owner). I purchased, and installed an Edelbrock Performer intake manifold to help with performance and fuel mileage. Well, the car ran great for a couple of days then began to run really rich, leak fuel around the choke, and would not hold a tune. I changed out the Holley carb for an Edelbrock, and it's doing the same thing (except for the leak), running rich and has a really bad idle. Could this be a manifold leak?

 

Hi,
If he Edelbrock is used, I'd first check the float levels. It's an easy job on them. When you say "holding a tune", are you referring to the carb? Have you taken an engine vac reading? A vac gauge is a good tool for adjusting the curb idle mix settings on the carb. What model carb? BTW, a vac reading can determine whether you have a vac leak or not.
Good luck!

 

Hi, I haven't made any changes to the new Carb yet. But the old one would have to keep adjusting it along with the timing (forgot to mention the timing). Its the old style distributer with the points and coil. I will pick up a vacuum gauge when I go to town. I am not much of a mechanic but I am learning quick. I am going to watch the video that came with the carb.
Thanks

 

OK, good! You hang around here awhile, you'll learn to be a good mechanic. Timing is a very critical system to get to understand and learn to adjust. You have advance as in "Initial", you have advance, as in mechanical, and there is advance, as in the distributor vac canister. Three, to get to know.
Good Luck!

 

Seems that swapping the carb did the trick. I just watched the video, and made a few adjustments. Thank you for your help.