It's your CV joints. I had the same problem
has the same problem with a 92 Pontiac bonniville with the 3800 ended up being the cam position sensorI justot work.
possibly on of the belt pulleys or a vaccum leak
are you sure it is valve chatter,Thought i had same problem but it was the rotor on the distributer hitting on the cap due to a bad top bushing in the distributer.
yes,if the inner vacuum bladder is cracked it could cause a vacuum leak,this could cause a problem at idle also.
cause u feel cold what do u think
sounds like a motor mount is broken or a transmition mount. have those checked.
Yes timing can delay your acceleration
Might just need a front end alignment or maybe balance and rotate your tires.
net force.
Acceleration
Just the opposite. It will cause the acceleration to drop by 50%.
We have one that does that. The mechanic told us it was 2 bad motor mounts, but I haven't fixed them yet (so cannot verify the diagnosis)