What's could be the problem with my Ford Fiesta

Hi, I have a 2002 fiesta mk6 1.4. Aztec
Recently I got in my car to go for a drive and the engine was very shuddery and I had very little power, after driving a mile or so I tried to round a corner and the car died. I drove the car home with very little power and the engine felt as though it would die any minute. Sent car to local garage and was found that there was water in the spark plug wells. He replaced the spark plugs, also tasted the water and said there was no antifreeze present. Got the car back tonight and though it is much better and not shuddery. There's very little power in the car. Even in 4th with straight strech of road and foot to the floor I'm struggling to hit 60mph. The car just feels though it has no performance at all and builds speed extremely slowly. Also worth noting after driving from garage to home there was a sort of burning rubber smell from the engine.
Any ideas, Help.

The smell is your clutch. It's probably on the way out or you can't drive that well mate, stop riding it xD.

Jokes aside probably your clutch, airflow could also be causing it but you would hear it

A real mechanic would have gone on a test drive after working on the car and noticed the lack of power! I'd find a different place to take the car. Don't go to a tire store, Midas, Walmart, or Pep Boy's. Find a real mechanic at a private garage or go to the dealer!