KIA AVELLA III WITH PROBLEMS - I need advice

I have a Kia Avella II, and for a while I started with a strong shrieks when I started to take off when you start to warm (20 minutes) this noise appears when I press the intoxicue, when it passes changes, it is persistent and sharp, I have also noticed that when I have been handled more than an hour it begins as to lose strength, almost to the point that it seems to stop, but when it is recovered, but it is recovered, but it is recovered, but it is recovered. Bantante strength and I have to stop, someone could advise me what can be to take it to the mechanic without being more expensive.

Hello, it can already be a clutch problem, you may be able to get the ruleman of thrust obviously already opens the plate so there is no other than throwing the old and putting a new clutch kit. Greetings I hope you have been useful and tell me if that was greetings

It is VWEDAD what Crashz says is the problem of the box if it does not have the disc, and the chillido when the IE