the car was jerking bad started to drive it home stopped jerking and code po 303 on 1999 Ford Escort

i was drive to work today and stopped at the gas station and started the car and it was jerking bad so i called into work and pulled over and called the auto part store and they told me to take it to get fix asap cause check engine light was blinking so i was driving home and it stopped jerking so took it to the auto part store and they hooked it up to there computer and it showed a code po 303 #3 misfire what could cause it to start misfiring and then stop

by in Ames, IA on October 22, 2012
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2 answers 1 comment
ANSWER by , October 22, 2012
you have a misfire on cylinder 3 of a 4 cylinder vehicle...i would do a compression check first to rule out engine mechanical problems...then change spark plugs while at it....if that does not fix it...check your fuel injector.
COMMENT by , October 23, 2012
DON'T FORGET PLUG WIRES. DON'T FORGET PLUG WIRES.
ANSWER by , October 23, 2012
you may have a failed spark plug in #3 cyl or ign to it.try a new set of plugs 1st if that doesn't help you may need a diag