rx-7 help

I purchased this car and drove it about a 1,000 mile before it started to run bad. I drove it to dinner one night and it ran great and when I went back out about two hours later it started to run very weak with no power and I have not found anyone that knows anything much about RX-7 to be able to work on them for me. would any one no what the prob would be.

year of car and use of normal size font please