I have a 1959 Skyliner with a 352 4 barrell.

As time goes on this Summer it seems my car is getting slower and slower. The problem I have is that the acceleration is getting more sluggish and somethimes I feel a need to downshift the automatic just to get a little more bite.

I might have a slight exhaust leak - would this make it worse?

It doesn't matter how far down you puch the accelerator it just goes slow.

I thought taking it out on a cold night might make the difference but the sluggish perfomance continues.

Thanks in advance.