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I disconnected the exhaust after the cat and it seemed to run a lot better (sorry neighbours) managed to easily get up to 70 on the A12 and going up hill it wasn't struggling at all. Guess I'll get it up and have a look underneath see what's going on.

Thanks, still learning about all this stuff, I'll sort out checking the exhaust in the morning and go from there. Really hoping that is it, gets a bit frustrating after a while!

Thanks for the advice, my timing advance when I recorded it before went between 3 and 32, 32 when going up the same hill I just went up. I'll see if I can remove the rounded bolt holding the heat shield on in a bit so I can loosen the cat and see if that helps.

I only get readings from my scanner every few seconds but just took it up a hill to check the sensor, it started at 0.8 and decreased to 0.6 I was flat out in second slowly crawling from 20-25mph. My MAF sensor was hitting 25 g/s max and the car wouldn't go above about 3500 revs.

I've put a new tank of fuel in and doesn't seem any different so sadly don't think it's that. I'd already ordered a new fuel pump so I'll change that and have a look at the injectors and regulator. I'll keep going don't want to give up on it just yet as I think (hope) the engine is fine still.

Ok so replaced the throttle body with a second hand one and no difference, got an obd2 scanner and an app and it seems like both old and new MAFs are at least giving a reading. Coolant temp seems fine and fan comes on when needed. My o2 sensor graph looks fairly off and the fuel trim seems off...

Thanks for the replies, yeah only got myself to blame for thinking a cheap one would work.. Managed to find a second hand supposedly fully working throttle body on ebay so will wait for that to arrive and give it a try then go from there.

Hi all, Looking for a bit of advice, I've got a 2002 K11 1.0 with 65k miles on the clock, ran perfectly until September time when it seemed to lose power, it would struggle to get up to 50-55mph and going up steep hills is 20mph flat out in second gear. It sat SORN till last week when I got it...