ive just had my car back from garage after cambelt snapped and took all valves its a been replaced etc but now the car stutter when accelerating in 2nd and 3rd. once its going in 3rd upwards its ok but in early gears it feels theres sum flat spots. shud i check the sparkplug gap too see if that qures it (I DO NEED TO NO THE SPARKPLUG DEPTH ON A FORD ESCORT 1.6 ZETEC 1999) If not the plug could it be the timing or sould i start looking at things like maf sensor I.A.T sensor etc????????????? HELP HELP