hi, i really am stuck and i was wondering if anyone could help!! i don't know anything about cars at all. my manual 98 Mazda 626 GXi started to lose power whilst we were driving home along the motorway. (we eventually got towed home) i took it to a garage and they changed the sparks and then a mazda garage told me to change the leads(which i did). but my mazda is still jumpy from about 40 - 60 is starts to jump. the faster you get the more it jumps. if you accelerate quickly it seems to jump! like the fuel is getting through. can anyone help! i love my mazda and am very worried that this might cost some serious money!!

Your description is confusing to me, but I think the mechanics have misdiagnosed the underlying problem. I suggest that you take the car to a different shop and get a fresh opinion.