1997 Honda Civic distibutor

Ok so my car run like crap when I put any kind of load on it. When its cold (under 30 degrees here in indiana) its runs ok for about 60 seconds then it will cut out and I will hear backfiring comming from the intake and exhaust. I think its my distributor but im not forsure and I want some profesional advice before I go out and buy a distributor. I changed the cap and rotor and same problem. The plugs were changed this summer or fall with ngk plugs. It will run ok if I barely but a load on it but as soon as I try to accelerate it sputters. Any help would be appreciated.