My 86 cadillac shakes, when icome to a full stop at a stop sign and go to accelerate it sometimes rumbles before it picks up speed after it picks up speed it runs good .It only happens when i stop..and try to pick up speed to take off.
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I bet it shakes under light/moderate acceleration and will also stop shaking if you let off the gas?
If so your best bet is to bring it to someone who is very good with driveline. It is fairly common for worn drive axles to cause this symptom however an engine misfire will also cause a similar symptom.
at 45 miles an hour overdrive engages putting a lot of load on the engine. Weak ignition components can cause a misfire that only shows up under this extreme load. It is very important to have somebody who is very good at solving these issues take a look at it and determine exactly what it is. I have literately had customers admit defeat after installing every ignition component, every sensor, and even transmissions only to find out a few hundred dollar drive axle was the problem.
There are a lot of reasons why this can happen, I would check for a vacuum leak, and if that proves not to be the case, look for a faulty O2 sensor.. This is very common, Is your check engine light on?
Could be the crankshaft sensor, or even water in the gas will do this try a can or two of dry gas first. Is the check engine light on? When was it serviced last? Such as tune up, air cleaner, fuel filter, plugs etc.
You should post what year, what engine eg. 5.7L, and if you have an check engine light on. Does it smooth out after you get moving? or does it falter under acceleration? You could have any of a number of issues.
The acceleration problem could be very dangerous as you may know. There could be several reasons for this, and to post any fix would be haphazard and irresponsible on my behalf so I will not post a potential fix/solution. It needs to be checked immediately by an expert, again this is very very dangerous do not drive the car if the accelerator sticks.
The shaking, has the car been tuned up? Plugs, wires, etc...is there a check engine light ? Start there.
If the engine is NOT running correctly, it is very possible that the torque converter slip speed could cause a hard bump when you put it into gear, again, this goes back to the shaking issue/engine performance.
GET THE "keeps accelerating after I let go of the gas" ISSUE FIXED BEFORE YOU DRIVE THE CAR. Again get it fixed by an expert. This is not something that can be solved or diagnosed without actually looking at it....
i had the computer flashed to the latest version at the dealer for free, and the shaking is gone and idle is back to normal. i was kicking the car back to normal idle just like you.
(although, i'm not sure if there's a deeper problem or not. now i'm experiencing sluggish acceleration and sometimes have difficulty accelerating over 60mph. sometimes fine, sometimes not. so you might run into that next...)