My best guess on your description is the air mass meter is at fault. I have had this problem and after this part was replaced it no longer occurred.
The shaking is the only symptom that doesn't fit and is perhaps a separate problem. Could it be the shaking is because of speed, and if you could go above 70mph would be even worse?
This would point to a problem with steering/tyes/suspenstion.
Sounds like fuel filter is clogged or fuel pump going bad. Try replacing fuel filter (least expensive) first.
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unfortunately I don't have any trouble codes and I know very little about cars. sometimes the cars stutters in 2nd and 3rd gear, and it gets to 60-70 mph and loses 500-1000rpm and around 15-20mph, and won't rev over 4500.
do u have any system trouble codes?
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