So, I bought a 99 Civic EX a while back and ever since I bought it, it has been idling funny. The RPMs will bounce around under 1000 RPMs, also sometimes while driving (in gear, clutch not engaged at all) the car will bog down and become jerky like its not recieving gas. If it matters, I have an aftermarket AEM intake installed. Any help/suggestions for the problem is happily accepted! Im hoping to fix this before winter. Thanks in advance!

 

haaha mine had that problem, take your throttle body off and clean out your idle air control valve and your fast idle there both on the throttle body close to each other there is carbon built up in it clean it then put it back together trust me happened

 

You likely have two problems, the IACV doesn't affect driving it's just for idling. Becoming "jerky" at low rpm and heavy throttle is almost always misfiring due to weak sparks.