1990 Mazda 626 will start and run for a few seconds then die now that the weather is warm it will not start at all if you have checked the fuel pump and injectors what else can it be?

Could be a bad ignitor, those were notorious for overheating and cracking in years up to 1994. The ignitor is the trigger circuit inside the distributor, by the way.

I replaced distributor and problem was fixed

I had the same problem on a 1991 626. It also was a bad igniter that I believe is built into the distributor. The mechanic said to replace the dstributor, I did, and it's still running fine. (4years later)

Bill Smith