I took my car for a custom remap last week. It went on a 4wd dyno before and after. The standard reading was 149bhp The remapped reading was 180bhp I would have thought that the remapped reading was what it should be like anyway at standard. Maybe the 149bhp should have rung alarm bells with the tuners and they shouldnt have done it. I took it home and it was fine all the way, parked it up and went out later. As soon as i set off it started jerking at low revs, as soon as i floored it, it seemed fine. When i let off and crusied the problem came back again like the fuel pump was cutting on and off. I turned around and went home, when i got home i could hear the cat ticking really loud glowing slightly. I have since changed the coilpacks air flow meter and lambda sensor with no joy. I took it back to the tuners saturday and they changed some settings telling me the torque was turned up too high. It now runs ok but the power seems to come in stages through the rev range. The cat doesnt glow now but the exhaust is quite a bit louder. Still concerned that something is wrong with the car and whatever they have done is going to cause some damage. Its been on numerous fault diagnosis machines and there is never any faults recorded. I raced a standard renault 5 turbo last light and only just beat him. Any help really appreciated.