Hey guys, car in question is no hotrod. 1991 honda civic. It is a 5 speed manual and I am experiencing an extreme misfire ONLY under load. For instance if I put it in 4th or 5th and floor it with the vehicle speed around 40mph, the engine will jolt and misfire causing the whole car to bounce around. Also if I select too high a gear and go uphill I will have the same symptoms. I am leaning towards an ignition issue (maybe the plugs just need changing) because I believe a weak spark could cause this. If you guys could give me some possible causes for misfire under load it would be greatly appreciated.