New to the forums to sorry if i get anything wrong.

I have had my Grande Punto 1.4 8v 2009 since September 2015 and haven't had any issues with it, i replaced the oil breather pipe as it was smelling in the car, during doing this i broke a section on the air box but used strong glue to fit it back on. There where no issues with the car for over a year of use.

Roll on last week and the car went in for its MOT, got the car back and headed off for a drive, once the engine had heated up around 15-20 mins there was suddenly a lack of power in all gears. I would be driving normally and go to accelerate and nothing, foot to the floor and it would feel like it was bogging.

This issue wasnt there before the MOT and i have had it back at the same garage who ran a diagnostic and came back no faults, i told them about the air box and the guy says he noticed it was loose and stuck it back on for now. As soon as i get it back out it starts doing the same thing again.

I dont have a lot of money so im trying to find the problem myself, Im thinking it could be misfire so possibly change sparks, or could it be a hole in the manifold/exhaust? i read on one thread a woman got told water in the fuel tank?

Any ideas would be vastly appreciated.

Cheers, Dane

Apologies for the wall of text.

Hi and welcome Dane,

the ignition/injection system rely on sensors on the engine; a losen airbox may have disconnected one of those sensors so the Engine Control Unit (ECU) would switch to "safe" mode, basically just allowing you to reach the closest Fiat service station...
There can be multiple reasons why the engine goes in limp mode, I'd first remove the airbox and inspect all connectors...
I strongly doubt about the spark plugs or the water in tank, how long ago has the air filter been replaced/cleaned ?

Regards, Bernie