I have a 2002 ford focus 2.0 zetec motor, what is wrong with it?

It will start and run for a minute or two then dies when it gets warm. I can only Rev it half way before it chocks itself out and dies, plugs wires and coil are good and new. I'm a good parts swapper but diagnosis is not my strong suit. Someone I do not trust worked on it before I got it and did the fuel system, pump, filter and injectors. Timing belt is worn but ok I think, I did buy the tools to do it, crank pin and cam tool. Now i just need the belt. Can someone please help me I sank my money into buying the car and only have a bit more to fix it. I don't know if it's the cat or fuel pump was done goofy or what.

How to modify my 2001 ford focus ZTS?

I know my 2001 ford focus ZTS doesn't have much room for improvement in performance but what kind of performance modifications can I do? ECU tuning chip? Headers? Performance rotors and breaks? Lowered suspension?

Ford focus lights and alarm chime keep twitching, what could be the problem?

Took to O Reilys to get checked becuse all of the gauges weren t working, all at 0 --null reports say it's needs a reset on the computer, ok done. Now the lights and alarm chime twitch repeatedly! Help please.
P.s
By alarm chime I mean that noise that comes for leaving the keys, opening the door etc.