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when hot has no acceleration

Ford Focus 2003 automatic. when hot has no acceleration. There are no warning lights on dashboard. In neutral idles

perfectly.Water temp gauge is normal. Starts perfectly. Had diagnostic check.....shows no problems.Car is fine when cold.

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You might be better served searching for Ford Focus forums with owner/members sharing experiences and diy info, Without extensive background info, this can be one or several issues related to; the EFI system made up of the fuel pump, fuel pressure, injectors, ignition system for spark, throttle position sensor, map sensor, O2 sensors, emissions equipment, exhaust system with catalytic converter (partial blockage), aftermarket modifications interfering with the EFI system, etc.

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