About a month ago my car all of a sudden started shaking at about 1500RPMS and higher, but only on acceleration. It also started showing a P0171 code. I changed the MAF hoping that would be it, I got the code cleared but it still shakes but with no check engine light. It does shift a little high when I first start it but shifts normal after a while. One guy on a different forum told me it was my Cv axle, but that doesn't sound right. Why would the car feel normal if I am not accelerating. Any ideas??

 

Motor mounts?

 

Just changed right side motor mount. It was completely torn. My engine was also vibrating at highway speeds. Made all the difference. runs like new. Also changed out the timing chains and guides to stop the annoying whine. $1200+ but she purrs now.

 

Motor mounts should be inspected. Believe the front mount is made with two molded pads of rubber with electric pad in between. Side mounts are again two pads of rubber with a silicon pads in between. Motor mounts used to be just a solid pad of rubber and we didn't see so much failure. These new mounts give better rides between engines and body frames. So guess we now have better rides.