Car Sounding Like An Old Gas Lawnmower!

[hkspowers]

Ok, So I replaced my radiator because my last one had a crack in it. I bled the system properly and after installed I drove the car for two days and it ran fine. Then all of a sudden the third day it sounds like an old gas lawnmower and it drives like shit, very slow and jerky and then if I let up on the accelerator just the slighetest bit it returns to normal, and I can drive normally until I shift. Then the same process starts off shitty but if I let up it is fine then I can accelerate as usual. Now I do not know if it was just a coincidence that this happens shortly after the rad install but I thought I should mention it. Also I have a 93 civic sedan exhaust on the car now. I drive a 93 civic Ex coupe d16Z6. Also I notice it sounds almost like a put put noise from my cat. Well If anyone has suggestions please let me know. I am in a tight place fnancially because of school so I am asking in hopes it is a thing I can replace the part myself saving labor cost.

Thanks,
James

[Siege911]

i'm assuming no cel's? that sounds like our old 84 accord, but that thing was carbeurated, and it wouldn't go when the car was cold... i have no idea what it could be, sorry

[hkspowers]

Yeah i forgot to mention, no warnings or cels.