Car wont move

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My ford escort 92 have a problem that it wont move and when it does it goes like a snail even when pressing the axe hard, it cant even go up the bridge. mechanic told me it's the fuel pump - we changed the fuel pump and all the filters (fuel, air and oil change) and it still have the same problem. it's not going at all. when im drove it i had to put on hazard lights. HELP