so i have a zetec with ported and polished head milled .040 with stage 2 cams and upgraded valve springs thats what i put on my car...everything is hooked up rechecked timing and connections etc...at idle (1000 rpm) car has <10 in of vac. heres the other funny about it...if ur cruising in 4th or 5th around 45 mph my car feels like it has a funny slight buck/shake in the motor...its fine passed 3k but only with those gears it has the shakes...i know the cams pull down vac but ive had them in for a while on a stock head and it wasnt near this bad...i have 93 octane in it and an xcal 3 but its not helping me...oh and im gonna compression test it later today...