hesitation on 1998 Ford Contour

what make my car hesitate, check enging light on, after running for a hour or so. placing foot on excelator car
will slow down, then thrust forward, sound like engine about to fall out. today car want go above 20mph, then
thrus forward and the slow again.

Asked by for the 1998 Ford Contour
you need to find the code to find out what system has a proble. could be a mass air flow, fuel delivery or clogged cat converter. take it to a shop and let them tell you the issue

thank you