2002ck230m
 

Today the car started but bucked side to side and the check engine light went on. Got it to the dealer and noted the car had a sense of sideways instability while driving on the highway- check engine light still on. Dealer called and they are ordering 'spark plug suppressor'- can someone explain what's going on- how this happens to a vehicle with less than 40K (eg amI using the wrong gas) and would this repair correct the feeling of side to side instability? Oh also noticed over the last two weeks that sometimes in either 1st of 2nd the car would not move- it sounded like it was going but just stood still- at that time i thought i might have one wheel on an ice patch or something- thank you for any 'education'.