Q: Pulsing

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I got the truck about 4 months ago it has been doing this since I got it about 2 months ago it had to go into the shop because the pulsing got really bad and my check engine light came on and I couldn't back up without the the stalling it was the camshaft position actuator solenoid, it's still doing the pulsing and shop can figure out what it is. When stopped at a light the entire truck pulses or rocks but if I put it in park or neutral it stops pulsing. Wanna get this figured out and taken care of

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