4.4L Jerky roll/take-off from lights

[Memm]

Hey guys,
Have a BMW X5 4.4L (M62)
Recently changed the timing chain guides as usual since they are common and mine gave way... Ever since (last week) whenever I stop at the lights, and I take my foot off the brake to go, as usual the car rolls forward since it's an Auto but it feels like it is about to stall/jerks but once I apply throttle it all clears up and drives like a dream! doesn't miss a beat and can really drive it hard once off the line, which takes my attention AWAY from incorrect timing being the issue.

Also, a separate problem which may be related is that my drivers side (right side when looking at the back of the car) Exhaust tends to blow out a little, but noticeable more amount of smoke than the left side, and can slightly hear a *pap pap pap pap* gargling V8'ish sound (Which isn't normal since its only one side)

Would appreciate the help heaps!
Sorry for the low quality post, tried to describe the problem as best I could

Thanks in advanced!