hey guys, i'm in need of some help. i just finished my minime in my 96 civic ex. i took it easy for 500 miles and just about an hour ago i got on it on I-64 and around about 4000 rpm my car seems to stutter, the speedometer and stock tach are going crazy while this is going on. if i shift before 4000 rpm everything is all good, it runs just like it should. also whats up with my car when i take off it has poor throttel response, i just put new spark plugs and wires in my motor so whats the deal guys, HELP ME