Slooby

I'm helping my friend back in GA work on his civic. It a 1993 honda civic ex, with a mini-me in it. It has a d15b7 bottom end and a d16z6 head, he fried the stock p28 computer and now had a p06 computer until 2 days ago when we put a p07 in it. we hooked up the computer and started it up and it was running good, hit vtec strong and everything but then it just started dying and when you put the pedal to the floor it would barely go past 1000 rpms. He says it might be the timeing belt where it could have jumped timing but i wanna make sure and see if anyone could give me a hand. Thanks in advance.