Ok so i'm having some problems with my car, but there is one in particular that is really starting to get to me. when i accelerate past 80, then take my foot off the gas, my car vibrates as it slows down. then when i put my foot on the gas again it goes away and accelerates smoothly.
Another problem i'm having is that when i am in neutral, and i press the gas to rev up, the tach drops to about 100 or 200 rpm, and the car almost turns off(sometimes it actually does turn off). why is it doing this? it started after i took my car to the body shop. i know it doesn't make sense, but that's when i noticed it.
Any suggestions would be appreciated!

 

okay first when do you accelerate past 80? track/strip? and second why are you reving in neutral?

 

Almost sounds like the shuddering could be a broken motor mount but I doubt that's the problem. At higher speeds sometimes when I take my foot off the throttle the shifter will vibrate more and then quit after 5 seconds or so, but that's normal.

For the throttle dying on you, try cleaning the MAF sensor with some maf cleaner from autozone. You can also try resetting the ecu or resetting and relearning the throttle control.

 

sounds like you might new 2 do a small tune up...how old/miles on your Z?

 

i mean when driving on the freeway. normal everyday driving. i live in los angeles, so there are times when i can drive pretty fast.

 

I have an 03 with about 45,000 miles on it. what constitutes as a tune up to you?

 

j/k