Why is car vibrates after spark plugs change?

Just changed spark plugs from 02 lancer. I noticed it vibrates a bit esp when im on stop. And also when you step on the gas pedal it accelerates right away like so fast. What have I might done wrong? ThanksWhy is car vibrates after spark plugs change?maan, you may have done several comon mistakes. 1st did you gap the plugs all to the required gap? sometimes plugs are pre gapped but never trust this! a plug can be accidentally dropped or wrongly set. 2nd connected fully on the plug. a spark plug boot most times is a snug fit and people often think its seated on the plug but the metal spring cap may be just touching and not fully engaging. 3rd %26quot;1,2,3,4 or was it 1324 oops%26quot; its shocking how easy we can mix 2 wires, sorry for the pun. lastly damage to the plug wire from hard removal or damage to the plug from a poor fitting spark plug socket. the insulator for a plug is ceramic, a type of glass and they arent user friendly a cracked insulator can allow arcing between the plug and the cylinder fouling the plug and as to the wire most are a carbon core. they handle heat, carry voltage,flex to the angle needed but dont like tugging. also most plug boots are sylicone rubber to resist heat ,oil, moisture etc but with use and time become weakened and can rip. again arcing can ocur.Why is car vibrates after spark plugs change?you should make sure the plugs are properly gapped to spec that could be a problem also check wires or coils and make sure none are loose or bad