have a santa fe 2003 when driving at 20 miles an hr is seems to slow down at times and other times it seems to surge up. please what could be wrong? highway it moves smoothly
Have you ever done or had a good top end cleaning done on the car which would clean the Air intake, Throttle body, intake mainifold
What is your tachometer reading during these failures? If the tach reads low went the car is going slow and revs up when the card surges....follow the advice giving in the above answer. However if you have an automatic transmission and it is experiencing a shifting problem..the tach will read high when you feel the car going slow and read low as it surges. 20MPH in most AT's is a shifting point from 2 to 3 gear...and with this failure the car will go smoothly on the highway because at 35 to 40 MPH the transmission with go to high gear and and not shift again until you slows the car.
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