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Why does my sonoma stutter/shake between 5 and 10 mph?

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My 02 sonoma with the v6 4.3 will kinda shake when accelerating between 5 and 10 Mph, If I accelerate somewhat slow then it seems fine and really dont shake but if I gas it like im in a hurry it shakes and then disapears and it is smooth as can be. The shaking seems to be coming from the engine area behind the dash. I have replaced the spark plugs, fuel filter, air filter, cleaned the mass air flow sensor, cleaned the throttle body intake, just yesterday I took the distributor cap off and inspected the points on the inside of the cap and they were all corroded up so i cleaned them up the best I could so they still appear unperfect although they look much better than before. What else might be he problem? EGR valve? ignition coil pack? the whole distributor? you name it and ill check it guys. I appreiate anyone that can help me out. I will be online alot so I respond quick. :gmc::thumbs:

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