1988 190 e. should there be freeplay in the air flow sensor plate with the engine off? i have the fuel mixture set to approx. 45% duty cycle but have hesitation on acceleration and low power that builds up slowly. if i depress the air flow sensor plate there is approx 3/8 inch freeplay before it hits the adj screw. is this my problem? any other areas i should investigate? thanks! moneypit