My 81 celica has this slight vibration wich you can feel most when driving on the highway, it happens at any speed and it comes and goes but consistent, meaning that i feel it all the time, it never goes away.
does anyone have any idea what could be causing that?
If this problem exists at high speeds (like 60MPH to 75MPH) the U-joints in the drive shaft could be to blame, but the 81 Celica also has a "center balance bearing" in the middle of the drive shaft (essentially a center mount to the car's floor), and it only has a u-joint behind it - not in front of it. If any of the engine or transmission mounts are damaged it can wear out the center bearing prematurely. Sadly, the Celica also had eight mounting specs for this part so if you just want to replace the drive shaft it may take a lot of work to find one that fits, HOWEVER Toyota's factory repair manual does include detailed instructions on how to rebuild all of these parts if you can ground your car for a few days.
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Warped brake rotor usually cause high vibration at high speeds. But you can also feel it at lower speeds. But bad ball joints and tie rod end will cause vibration at high speeds. Ball joints will pop at pot holes, sometimes. Tie rods can be felt in the steering wheel at a stop. Move the wheel slightly to the left and right, you can feel/hear a tap as you turn it.
You may want to check your motor mounts. If the mounts are broken or just too old they will cause the engine to have excessive vibration your notice also when shifting to drive or reverse it will feel like the vehicle jumps. replacing the mounts will help if they are damaged or may be that the vehicle needs a tune up.
your highway acceleration problem could be a coil problem. Not sure if that year of chev has coil packs or not but experienced same thing with ford 5.4L. went through 3 coil packs and did the same thing each time before biting the dust. Transmission seems to be sticking on the 1to2 upshift and could be a sticking solenoid in the valve body of the tranny. If the shifting problem persists then the tranny deffinately has to be rebuilt. It's made it quite far if tha is the original tranny, you cant expect too much life out of it if it has been worked hard. I highly doubt a fluid change would help at all. Or if you want, you can buy a can of new truck from GM for about 25 to 35 thousand bucks! Typically works great!