i bought a93 civic 2dr with a b20b non vtec 99 it doesnt like to idle they jump up and down unless you give her gas i also have a running b18b non vtec with auto tranny still on it idk if i should do an complete engine swap or keep the b20b bottem end and put the b18b top end on it?? please help me im not 100% sure what would work best i heard b20b bottem end was more strong??

 

The bouncing idle could be caused by a couple things. Vacuum leak, idle air control valve, intake manifold gasket ect.

 

Damn...beast *** run-on sentence. So you have an auto b18b and a b20b in the same car? Damn bad *** project car.

 

B20 sleeves like to crack lol the exact opposite of what you've been told. just go B20V....