I have a 97 HX manual tranny. The problem is when it gets warm, the idle is normal for a while until it feels like its gonna choke and die, but it doesn't. It drops low and regains power, almost like a misfire but I don't think its that bad. I did a full tune up and replaced the plugs, wires, filters, cap and rotor. The problem is still there. Also when I'm driving, I can sometimes feel the car jerk its like its losing power but regains. When its idling normally, it does so around 700rpm, but when it "loses power" it goes down to maybe 200rpm or even less. There is no engine code or no check engine light. I also checked for vacuum leaks and as far I can tell, there aren't any. Please help. Thanks.