问：失去力量

我有一个2001本田前奏，弯曲管上有排气泄漏，然后当我撞到汽车中的气体时，汽车超过4000 rpms，汽车犹豫不决，一旦我这样做，Cole以1000 rpms和then hesitates at 2000 RPM‘s so it drops to 1000 RPMs and almost dies once I get it going it shakes when I’m at a stop in sometime stars so far I’ve change the O2 sensor and I’m thinking of cleaning out my EGR valve once in neutral and running in first gear when they take off it sounds like a go cart it does smell like gas in my engine bay or might be a head gasket I don’t know what else to do about me losing power

我的汽车有175000英里。
我的车有手动变速箱。