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Q: Runs and idles fine until heats up. on 1993 Mazda 626

My masda 626 runs fine and idles fine until engine heats up then it misfires when i accelerate and loses power. I cleaned my egr-valve replaced my maf-sensor(with original masda626 maf) and still no luck I haven'n replaced spark plugs or plug wires as of yet any advice?
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